{"product_id":"efest-18650-3000mah-20a-battery","title":"Efest IMR 18650 3000mAh 20A (35A Pulse) Battery","description":"\u003cstyle\u003e\n.efest20-desc{\n  --bs-black:#000;\n  --bs-ink:#1f2328;\n  --bs-gray:#f3f5f6;\n  --bs-line:#d9dee3;\n  --bs-orange:#ef6f07;\n  --efest-purple:#6f35c4;\n  --efest-red:#c81825;\n  --ok:#108a00;\n  --warning:#ffb100;\n  --danger:#c81825;\n  --white:#fff;\n  --muted:#66707a;\n  --radius:18px;\n  --shadow:0 10px 30px rgba(0,0,0,.10);\n  max-width:1180px;\n  margin:0 auto;\n  padding:22px;\n  color:var(--bs-ink);\n  font-family:Arial,Helvetica,sans-serif;\n  line-height:1.45;\n  background:#fafafa;\n}\n.efest20-desc *{box-sizing:border-box;}\n.efest20-desc h1,.efest20-desc h2,.efest20-desc h3{line-height:1.12;margin:0 0 12px;letter-spacing:-.02em;}\n.efest20-desc p{margin:0 0 14px;}\n.efest20-desc .eyebrow{display:inline-flex;align-items:center;gap:8px;background:rgba(239,111,7,.12);color:var(--bs-orange);padding:7px 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th{width:34%;color:#111;background:#fafbfc;font-size:13px;text-transform:uppercase;letter-spacing:.04em;}\n.efest20-desc .badge{display:inline-block;padding:5px 9px;border-radius:999px;font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;}\n.efest20-desc .badge.ok{background:#e9f7e8;color:var(--ok);}\n.efest20-desc .badge.warn{background:#fff3d6;color:#9a6800;}\n.efest20-desc .badge.info{background:#f1ecff;color:var(--efest-purple);}\n.efest20-desc .badge.danger{background:#fdecec;color:var(--danger);}\n.efest20-desc .note{margin-top:12px;padding:12px 14px;border-left:4px solid var(--bs-orange);background:#fff8f2;border-radius:10px;font-size:13px;}\n.efest20-desc .mini-card{background:var(--bs-gray);border:1px solid var(--bs-line);border-radius:16px;padding:16px;}\n.efest20-desc .mini-card h3{font-size:19px;margin-bottom:6px;}\n.efest20-desc .formula{font-family:'Courier New',monospace;font-weight:700;background:#0f1113;color:#fff;padding:10px 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.efest20-desc{padding:14px;}\n  .efest20-desc .hero{padding:24px;}\n  .efest20-desc .kpi-grid{grid-template-columns:repeat(2,1fr);}\n}\n\u003c\/style\u003e\n\u003cdiv class=\"efest20-desc\"\u003e\n\u003csection class=\"hero\"\u003e\n\u003cdiv class=\"hero-grid\"\u003e\n\u003cdiv class=\"hero-copy\"\u003e\n\u003cspan class=\"eyebrow\"\u003e\u003cspan class=\"dot\"\u003e\u003c\/span\u003e product description\u003c\/span\u003e\n\u003ch1\u003e\n\u003cspan style=\"color: rgb(255, 255, 255);\"\u003eEfest 18650\u003c\/span\u003e\u003cbr\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003e3000mAh \/ 20A IMR\u003c\/span\u003e\n\u003c\/h1\u003e\n\u003cp class=\"sub\"\u003eHigh-drain \u003cstrong\u003e3.0Ah 18650 lithium-ion cell\u003c\/strong\u003e positioned for buyers who need a balance of runtime, compact size, and strong 20A-class current delivery.\u003c\/p\u003e\n\u003cdiv class=\"cta-row\"\u003e\n\u003cspan class=\"pill orange\"\u003e20A Continuous Discharge\u003c\/span\u003e \u003cspan class=\"pill purple\"\u003e35A Short Burst \/ Pulse Label\u003c\/span\u003e \u003cspan class=\"pill\"\u003e3000mAh Capacity\u003c\/span\u003e \u003cspan class=\"pill\"\u003e3.7V Nominal Voltage\u003c\/span\u003e \u003cspan class=\"pill\"\u003e18650 Flat Top\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"kpi-grid\"\u003e\n\u003cdiv class=\"kpi orange\"\u003e\n\u003cb\u003e20A\u003c\/b\u003e\u003csmall\u003eConservative Continuous Rating\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi purple\"\u003e\n\u003cb\u003e35A\u003c\/b\u003e\u003csmall\u003ePulse \/ Marketing Label\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi black\"\u003e\n\u003cb\u003e3000mAh\u003c\/b\u003e\u003csmall\u003eNominal Capacity\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi red\"\u003e\n\u003cb\u003e3.7V\u003c\/b\u003e\u003csmall\u003eNominal Voltage\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi orange\"\u003e\n\u003cb\u003e4.2V\u003c\/b\u003e\u003csmall\u003eMaximum Charge Voltage\u003c\/small\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"kpi purple\"\u003e\n\u003cb\u003e2.5V\u003c\/b\u003e\u003csmall\u003eDischarge Cut-Off\u003c\/small\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"two-col\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eEfest 18650 3000mAh 20A IMR Battery\u003c\/h2\u003e\n\u003cp\u003eThe Efest 18650 3000mAh 20A IMR cell is a high-drain, unprotected flat-top 18650 battery intended for applications that need a practical mix of runtime and discharge capability. Its 3000mAh capacity supports longer runtime than many lower-capacity power cells, while the 20A continuous discharge rating places it in the performance-oriented 18650 category.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003ctable class=\"spec-table\" aria-label=\"Efest 18650 3000mAh 20A specification table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand \/ Model\u003c\/th\u003e\n\u003ctd\u003eEfest IMR18650V1 \/ 18650 3000mAh 20A IMR\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCell Type\u003c\/th\u003e\n\u003ctd\u003e18650 cylindrical rechargeable lithium-ion IMR cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTerminal\u003c\/th\u003e\n\u003ctd\u003eFlat top\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Capacity\u003c\/th\u003e\n\u003ctd\u003e3000mAh\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Voltage\u003c\/th\u003e\n\u003ctd\u003e3.7V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum Charge Voltage\u003c\/th\u003e\n\u003ctd\u003e4.20V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDischarge Cut-Off Voltage\u003c\/th\u003e\n\u003ctd\u003e2.50V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContinuous Discharge Rating\u003c\/th\u003e\n\u003ctd\u003e20A \u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulse \/ Burst Reference\u003c\/th\u003e\n\u003ctd\u003e35A pulse \/ short high-load burst label \u003cspan class=\"badge warn\"\u003eDo not treat as unlimited continuous\u003c\/span\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStandard Charge Reference\u003c\/th\u003e\n\u003ctd\u003e2A where listed by supporting specifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Charge Reference\u003c\/th\u003e\n\u003ctd\u003e4A where listed by supporting specifications\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eProtection\u003c\/th\u003e\n\u003ctd\u003eNo — unprotected bare cell\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003eApprox. 18.5mm × 65.2mm; live product listing also shows approx. 18.3mm × 65.0mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWeight\u003c\/th\u003e\n\u003ctd\u003eApprox. 45.8g to 48g depending on listing\/source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRechargeable\u003c\/th\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section dark\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003eElectrical operating envelope at a glance.\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eThese quick-reference visuals summarize current, voltage, C-rate, and energy behavior in a customer-friendly technical format.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e1. Current Capability Stack\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eThe 20A continuous rating should be treated as the normal design ceiling; 35A should be treated as a pulse or burst label.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 280\" role=\"img\" aria-label=\"Efest 18650 current capability chart\"\u003e\n          \u003crect x=\"94\" y=\"72\" width=\"80\" height=\"138\" fill=\"#6f35c4\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"236\" y=\"118\" width=\"80\" height=\"92\" fill=\"#ef6f07\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"378\" y=\"158\" width=\"80\" height=\"52\" fill=\"#5d6772\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"520\" y=\"180\" width=\"80\" height=\"30\" fill=\"#108a00\" rx=\"12\"\u003e\u003c\/rect\u003e\n          \u003cline x1=\"70\" y1=\"210\" x2=\"640\" y2=\"210\" stroke=\"#c9d0d7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"80\" y1=\"210\" x2=\"80\" y2=\"50\" stroke=\"#c9d0d7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"110\" y=\"226\" font-size=\"14\" fill=\"#1f2328\"\u003e35A\u003c\/text\u003e\n          \u003ctext x=\"252\" y=\"226\" font-size=\"14\" fill=\"#1f2328\"\u003e20A\u003c\/text\u003e\n          \u003ctext x=\"396\" y=\"226\" font-size=\"14\" fill=\"#1f2328\"\u003e10A\u003c\/text\u003e\n          \u003ctext x=\"545\" y=\"226\" font-size=\"14\" fill=\"#1f2328\"\u003e4A\u003c\/text\u003e\n          \u003ctext x=\"78\" y=\"58\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003e35A pulse \/ burst label\u003c\/text\u003e\n          \u003ctext x=\"218\" y=\"106\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003e20A continuous\u003c\/text\u003e\n          \u003ctext x=\"365\" y=\"148\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003e10A high load\u003c\/text\u003e\n          \u003ctext x=\"505\" y=\"170\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003e4A max charge\u003c\/text\u003e\n          \u003ctext x=\"30\" y=\"52\" font-size=\"13\" fill=\"#66707a\"\u003eCurrent (A)\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e2. Voltage Operating Window\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eBasic per-cell voltage limits for lithium-ion charge and discharge control.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 640 250\" role=\"img\" aria-label=\"Efest voltage operating window diagram\"\u003e\n          \u003cline x1=\"50\" y1=\"125\" x2=\"590\" y2=\"125\" stroke=\"#ccd3da\" stroke-width=\"10\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"90\" y1=\"125\" x2=\"520\" y2=\"125\" stroke=\"#6f35c4\" stroke-width=\"18\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\n          \u003ccircle cx=\"90\" cy=\"125\" r=\"16\" fill=\"#c81825\"\u003e\u003c\/circle\u003e\n          \u003ccircle cx=\"520\" cy=\"125\" r=\"16\" fill=\"#108a00\"\u003e\u003c\/circle\u003e\n          \u003cline x1=\"90\" y1=\"70\" x2=\"90\" y2=\"178\" stroke=\"#c81825\" stroke-dasharray=\"6 6\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"520\" y1=\"70\" x2=\"520\" y2=\"178\" stroke=\"#108a00\" stroke-dasharray=\"6 6\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"63\" y=\"55\" font-size=\"18\" font-weight=\"700\" fill=\"#c81825\"\u003e2.5V\u003c\/text\u003e\n          \u003ctext x=\"476\" y=\"55\" font-size=\"18\" font-weight=\"700\" fill=\"#108a00\"\u003e4.2V\u003c\/text\u003e\n          \u003ctext x=\"110\" y=\"105\" font-size=\"18\" font-weight=\"700\" fill=\"#6f35c4\"\u003eUsable operating band\u003c\/text\u003e\n          \u003ctext x=\"43\" y=\"201\" font-size=\"14\" fill=\"#1f2328\"\u003eDischarge cut-off\u003c\/text\u003e\n          \u003ctext x=\"462\" y=\"201\" font-size=\"14\" fill=\"#1f2328\"\u003eCharge cut-off\u003c\/text\u003e\n          \u003ctext x=\"210\" y=\"160\" font-size=\"14\" fill=\"#66707a\"\u003eNominal cell voltage: 3.7V\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e3. Capacity and Energy Translation\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eNominal watt-hours are calculated from capacity and nominal voltage.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 620 132\" role=\"img\" aria-label=\"Efest energy formula diagram\"\u003e\n          \u003crect x=\"20\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#f3f5f6\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"225\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#f3f5f6\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"430\" y=\"24\" width=\"170\" height=\"84\" rx=\"16\" fill=\"#fff6ee\" stroke=\"#ef6f07\"\u003e\u003c\/rect\u003e\n          \u003ctext x=\"52\" y=\"60\" font-size=\"20\" font-weight=\"700\"\u003eCapacity\u003c\/text\u003e\n          \u003ctext x=\"42\" y=\"86\" font-size=\"30\" font-weight=\"900\"\u003e3.0Ah\u003c\/text\u003e\n          \u003ctext x=\"265\" y=\"60\" font-size=\"20\" font-weight=\"700\"\u003eVoltage\u003c\/text\u003e\n          \u003ctext x=\"258\" y=\"86\" font-size=\"30\" font-weight=\"900\"\u003e3.7V\u003c\/text\u003e\n          \u003ctext x=\"468\" y=\"60\" font-size=\"20\" font-weight=\"700\" fill=\"#ef6f07\"\u003eNominal Energy\u003c\/text\u003e\n          \u003ctext x=\"480\" y=\"86\" font-size=\"30\" font-weight=\"900\" fill=\"#ef6f07\"\u003e≈ 11.1Wh\u003c\/text\u003e\n          \u003ctext x=\"196\" y=\"77\" font-size=\"32\" font-weight=\"900\"\u003e×\u003c\/text\u003e\n          \u003ctext x=\"402\" y=\"77\" font-size=\"32\" font-weight=\"900\"\u003e=\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e4. C-Rate Conversion\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eFor a 3000mAh cell, 1C equals approximately 3A.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"C-rate conversion table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e2A\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e≈0.67C standard charge reference\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4A\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e≈1.33C max charge reference\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10A\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e≈3.33C high-load use\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e20A\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e≈6.67C continuous discharge rating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e35A\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e≈11.67C short burst \/ pulse label\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003cdiv class=\"two-col\"\u003e\n\u003cdiv\u003e\n\u003ch2\u003eVoltage sag and delivered capacity change as current increases.\u003c\/h2\u003e\n\u003cp\u003eAt light loads, a 3000mAh cell can approach its headline capacity. As current rises, voltage sag increases, heat generation rises, and useful delivered capacity depends more heavily on the device cut-off voltage and pack thermal design. The simplified discharge graph below explains this trade-off in a visual way.\u003c\/p\u003e\n\u003cp class=\"muted\"\u003eBecause a detailed manufacturer discharge curve was not available on the live product page, the curve below is a simplified, explanatory model rather than a digitized lab curve. It is still valuable for customers because it clearly communicates the main engineering point: higher current causes earlier voltage depression and shorter practical runtime.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"mini-card\"\u003e\n\u003ch3\u003eCurrent rating interpretation\u003c\/h3\u003e\n\u003ctable class=\"spec-table\" aria-label=\"rating interpretation table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e20A\u003c\/th\u003e\n\u003ctd\u003eUse as continuous-discharge product-page rating\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e35A\u003c\/th\u003e\n\u003ctd\u003eUse as pulse \/ short burst label, not unlimited continuous\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3.0Ah\u003c\/th\u003e\n\u003ctd\u003eCapacity headline for runtime comparison\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e2.5V\u003c\/th\u003e\n\u003ctd\u003eDischarge cut-off reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4.2V\u003c\/th\u003e\n\u003ctd\u003eMaximum charge voltage\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e5. Simplified Discharge-Curve Graph\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eVoltage vs. capacity illustration for 5A, 10A, 20A, and 35A pulse\/burst loading. Simplified for product-page visualization.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 720 400\" role=\"img\" aria-label=\"Efest 18650 3000mAh simplified discharge curve graph voltage versus capacity\"\u003e\n          \u003crect x=\"58\" y=\"26\" width=\"610\" height=\"300\" fill=\"#fff\"\u003e\u003c\/rect\u003e\n          \u003cline x1=\"70\" y1=\"40\" x2=\"70\" y2=\"326\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"70\" y1=\"326\" x2=\"660\" y2=\"326\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cg stroke=\"#e1e6ea\" stroke-width=\"1\"\u003e\n            \u003cline x1=\"70\" y1=\"90\" x2=\"660\" y2=\"90\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"140\" x2=\"660\" y2=\"140\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"190\" x2=\"660\" y2=\"190\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"240\" x2=\"660\" y2=\"240\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"290\" x2=\"660\" y2=\"290\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"188\" y1=\"40\" x2=\"188\" y2=\"326\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"306\" y1=\"40\" x2=\"306\" y2=\"326\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"424\" y1=\"40\" x2=\"424\" y2=\"326\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"542\" y1=\"40\" x2=\"542\" y2=\"326\"\u003e\u003c\/line\u003e\n          \u003c\/g\u003e\n          \u003ctext x=\"17\" y=\"45\" font-size=\"13\" fill=\"#66707a\"\u003e4.2V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"95\" font-size=\"13\" fill=\"#66707a\"\u003e3.9V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"145\" font-size=\"13\" fill=\"#66707a\"\u003e3.6V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"195\" font-size=\"13\" fill=\"#66707a\"\u003e3.3V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"245\" font-size=\"13\" fill=\"#66707a\"\u003e3.0V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"295\" font-size=\"13\" fill=\"#66707a\"\u003e2.7V\u003c\/text\u003e\n          \u003ctext x=\"17\" y=\"329\" font-size=\"13\" fill=\"#66707a\"\u003e2.5V\u003c\/text\u003e\n          \u003ctext x=\"65\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e0\u003c\/text\u003e\n          \u003ctext x=\"174\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e750\u003c\/text\u003e\n          \u003ctext x=\"292\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e1500\u003c\/text\u003e\n          \u003ctext x=\"410\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e2250\u003c\/text\u003e\n          \u003ctext x=\"532\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003e3000\u003c\/text\u003e\n          \u003ctext x=\"628\" y=\"352\" font-size=\"13\" fill=\"#66707a\"\u003emAh\u003c\/text\u003e\n          \u003ctext x=\"295\" y=\"386\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003eCapacity delivered\u003c\/text\u003e\n          \u003ctext transform=\"rotate(-90 18 180)\" x=\"18\" y=\"180\" font-size=\"15\" fill=\"#1f2328\" font-weight=\"700\"\u003eCell voltage\u003c\/text\u003e\n          \u003cpath d=\"M70 58 C125 64, 170 76, 220 92 C285 115, 340 140, 395 170 C455 200, 505 230, 548 264 C588 295, 618 313, 642 322\" fill=\"none\" stroke=\"#108a00\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 70 C125 80, 170 95, 220 116 C285 145, 340 170, 395 200 C450 230, 495 258, 532 286 C564 308, 590 318, 606 322\" fill=\"none\" stroke=\"#6f35c4\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 86 C125 100, 170 118, 220 142 C280 174, 332 203, 382 233 C430 262, 468 286, 500 307 C526 320, 548 323, 562 326\" fill=\"none\" stroke=\"#ef6f07\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M70 108 C118 130, 158 150, 208 181 C265 216, 315 250, 360 278 C408 307, 444 319, 470 326\" fill=\"none\" stroke=\"#c81825\" stroke-width=\"5\" stroke-linecap=\"round\" stroke-dasharray=\"8 8\"\u003e\u003c\/path\u003e\n          \u003crect x=\"442\" y=\"52\" width=\"210\" height=\"108\" rx=\"12\" fill=\"#ffffff\" stroke=\"#d9dee3\"\u003e\u003c\/rect\u003e\n          \u003cline x1=\"458\" y1=\"76\" x2=\"488\" y2=\"76\" stroke=\"#108a00\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"500\" y=\"81\" font-size=\"14\" fill=\"#1f2328\"\u003e5A light load\u003c\/text\u003e\n          \u003cline x1=\"458\" y1=\"100\" x2=\"488\" y2=\"100\" stroke=\"#6f35c4\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"500\" y=\"105\" font-size=\"14\" fill=\"#1f2328\"\u003e10A moderate load\u003c\/text\u003e\n          \u003cline x1=\"458\" y1=\"124\" x2=\"488\" y2=\"124\" stroke=\"#ef6f07\" stroke-width=\"5\" stroke-linecap=\"round\"\u003e\u003c\/line\u003e\u003ctext x=\"500\" y=\"129\" font-size=\"14\" fill=\"#1f2328\"\u003e20A CDR\u003c\/text\u003e\n          \u003cline x1=\"458\" y1=\"148\" x2=\"488\" y2=\"148\" stroke=\"#c81825\" stroke-width=\"5\" stroke-linecap=\"round\" stroke-dasharray=\"7 6\"\u003e\u003c\/line\u003e\u003ctext x=\"500\" y=\"153\" font-size=\"14\" fill=\"#1f2328\"\u003e35A pulse label\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e6. Estimated Runtime by Current\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eIdealized runtime from 3.0Ah capacity before voltage sag, cut-off, heat, and efficiency losses.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 620 260\" role=\"img\" aria-label=\"Efest idealized runtime chart\"\u003e\n          \u003crect x=\"160\" y=\"35\" width=\"360\" height=\"28\" rx=\"14\" fill=\"#108a00\"\u003e\u003c\/rect\u003e\u003ctext x=\"92\" y=\"55\" font-size=\"14\" font-weight=\"700\"\u003e5A\u003c\/text\u003e\u003ctext x=\"540\" y=\"55\" font-size=\"14\" font-weight=\"700\"\u003e36 min\u003c\/text\u003e\n          \u003crect x=\"160\" y=\"85\" width=\"180\" height=\"28\" rx=\"14\" fill=\"#6f35c4\"\u003e\u003c\/rect\u003e\u003ctext x=\"92\" y=\"105\" font-size=\"14\" font-weight=\"700\"\u003e10A\u003c\/text\u003e\u003ctext x=\"360\" y=\"105\" font-size=\"14\" font-weight=\"700\"\u003e18 min\u003c\/text\u003e\n          \u003crect x=\"160\" y=\"135\" width=\"90\" height=\"28\" rx=\"14\" fill=\"#ef6f07\"\u003e\u003c\/rect\u003e\u003ctext x=\"92\" y=\"155\" font-size=\"14\" font-weight=\"700\"\u003e20A\u003c\/text\u003e\u003ctext x=\"270\" y=\"155\" font-size=\"14\" font-weight=\"700\"\u003e9 min\u003c\/text\u003e\n          \u003crect x=\"160\" y=\"185\" width=\"52\" height=\"28\" rx=\"14\" fill=\"#c81825\"\u003e\u003c\/rect\u003e\u003ctext x=\"92\" y=\"205\" font-size=\"14\" font-weight=\"700\"\u003e35A\u003c\/text\u003e\u003ctext x=\"235\" y=\"205\" font-size=\"14\" font-weight=\"700\"\u003e5.1 min*\u003c\/text\u003e\n          \u003ctext x=\"160\" y=\"244\" font-size=\"13\" fill=\"#66707a\"\u003e*35A is shown only as a pulse\/burst label; do not use as a continuous runtime promise.\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eCharge behavior, thermal control, and cycle expectations.\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eBecause detailed manufacturer curves are not published in the live listing, the charts below use the listing values and supporting retail\/spec references to communicate practical operating behavior.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e7. Charge Profile Reference\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eA standard 4.20V lithium-ion CC\/CV profile with current taper near full charge.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 360\" role=\"img\" aria-label=\"Efest charge profile diagram\"\u003e\n          \u003cline x1=\"60\" y1=\"300\" x2=\"650\" y2=\"300\" stroke=\"#b5bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"60\" y1=\"30\" x2=\"60\" y2=\"300\" stroke=\"#b5bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cpath d=\"M70 220 L245 220 L340 120 L520 120\" fill=\"none\" stroke=\"#6f35c4\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M520 120 C560 120, 590 150, 612 220 C620 246, 625 265, 630 280\" fill=\"none\" stroke=\"#ef6f07\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003ctext x=\"92\" y=\"210\" font-size=\"15\" font-weight=\"700\"\u003eCC stage: 2A standard \/ 4A max reference\u003c\/text\u003e\n          \u003ctext x=\"525\" y=\"112\" font-size=\"15\" font-weight=\"700\"\u003eCV hold @ 4.2V\u003c\/text\u003e\n          \u003ctext x=\"525\" y=\"230\" font-size=\"14\" fill=\"#1f2328\"\u003eCurrent tapers near full charge\u003c\/text\u003e\n          \u003ctext x=\"18\" y=\"40\" font-size=\"14\" fill=\"#66707a\"\u003eVoltage \/ current\u003c\/text\u003e\n          \u003ctext x=\"315\" y=\"338\" font-size=\"15\" font-weight=\"700\"\u003eCharge time progression\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e8. Thermal Operating Guidance\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eUse conservative thermal limits because high-current cells heat rapidly under heavy load.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"thermal guidance table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCharge\u003c\/th\u003e\n\u003ctd\u003eCharge only within safe lithium-ion charger\/device limits; avoid charging below freezing or when hot.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDischarge\u003c\/th\u003e\n\u003ctd\u003e20A continuous loads require airflow, metal mass, or pack-level heat management.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e35A label\u003c\/th\u003e\n\u003ctd\u003eTreat as short burst \/ pulse usage only. Stop use if the cell becomes hot.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStorage\u003c\/th\u003e\n\u003ctd\u003eStore cool, dry, and isolated from conductive objects.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePack design\u003c\/th\u003e\n\u003ctd\u003eMeasure real cell-surface temperature in the enclosure under worst-case load.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e9. Stress Map by Current\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eIllustrates increasing heat and sag as load current rises.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 330\" role=\"img\" aria-label=\"Efest stress map by current\"\u003e\n          \u003cline x1=\"75\" y1=\"260\" x2=\"640\" y2=\"260\" stroke=\"#b4bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"75\" y1=\"260\" x2=\"75\" y2=\"52\" stroke=\"#b4bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cpath d=\"M95 230 C205 210, 300 185, 410 140 C500 103, 575 76, 625 62\" fill=\"none\" stroke=\"#c81825\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cpath d=\"M95 70 C205 95, 300 132, 410 173 C500 205, 575 232, 625 250\" fill=\"none\" stroke=\"#6f35c4\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003ctext x=\"190\" y=\"105\" font-size=\"15\" font-weight=\"700\" fill=\"#6f35c4\"\u003eVoltage headroom decreases\u003c\/text\u003e\n          \u003ctext x=\"385\" y=\"105\" font-size=\"15\" font-weight=\"700\" fill=\"#c81825\"\u003eThermal load increases\u003c\/text\u003e\n          \u003ctext x=\"92\" y=\"286\" font-size=\"13\"\u003e5A\u003c\/text\u003e\u003ctext x=\"250\" y=\"286\" font-size=\"13\"\u003e10A\u003c\/text\u003e\u003ctext x=\"420\" y=\"286\" font-size=\"13\"\u003e20A\u003c\/text\u003e\u003ctext x=\"590\" y=\"286\" font-size=\"13\"\u003e35A\u003c\/text\u003e\n          \u003ctext x=\"245\" y=\"318\" font-size=\"15\" font-weight=\"700\"\u003eIncreasing current →\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e10. Cycle-Life Expectation\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eCycle life is highly dependent on current, heat, depth of discharge, and charge current.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 340\" role=\"img\" aria-label=\"Efest cycle life expectation chart\"\u003e\n          \u003cline x1=\"70\" y1=\"285\" x2=\"640\" y2=\"285\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"70\" y1=\"50\" x2=\"70\" y2=\"285\" stroke=\"#aeb7bf\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cg stroke=\"#e3e7eb\" stroke-width=\"1\"\u003e\n            \u003cline x1=\"70\" y1=\"225\" x2=\"640\" y2=\"225\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"165\" x2=\"640\" y2=\"165\"\u003e\u003c\/line\u003e\n            \u003cline x1=\"70\" y1=\"105\" x2=\"640\" y2=\"105\"\u003e\u003c\/line\u003e\n          \u003c\/g\u003e\n          \u003cpath d=\"M90 75 C210 92, 310 120, 410 160 C500 198, 570 237, 620 262\" fill=\"none\" stroke=\"#6f35c4\" stroke-width=\"6\" stroke-linecap=\"round\"\u003e\u003c\/path\u003e\n          \u003cline x1=\"70\" y1=\"225\" x2=\"640\" y2=\"225\" stroke=\"#c81825\" stroke-width=\"2\" stroke-dasharray=\"8 8\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"508\" y=\"217\" font-size=\"14\" fill=\"#c81825\"\u003e~70% reference line\u003c\/text\u003e\n          \u003ctext x=\"190\" y=\"318\" font-size=\"15\" font-weight=\"700\"\u003eIncreasing cycle count →\u003c\/text\u003e\n          \u003ctext transform=\"rotate(-90 20 175)\" x=\"20\" y=\"175\" font-size=\"15\" font-weight=\"700\"\u003eCapacity retention\u003c\/text\u003e\n          \u003ctext x=\"100\" y=\"70\" font-size=\"14\" fill=\"#1f2328\"\u003eFresh cell\u003c\/text\u003e\n          \u003ctext x=\"465\" y=\"270\" font-size=\"14\" fill=\"#1f2328\"\u003e~300+ cycle listing expectation\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003e18650 dimensional envelope for holders, chargers, and pack CAD.\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eUse the larger published approximation for clearance planning, especially when designing sleds, holders, weld fixtures, or tightly packed battery assemblies.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e11. Cell Dimension Diagram\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eMechanical envelope based on published reseller specifications.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 700 420\" role=\"img\" aria-label=\"Efest 18650 mechanical dimension diagram\"\u003e\n          \u003crect x=\"120\" y=\"160\" width=\"420\" height=\"92\" rx=\"45\" fill=\"#d9dee3\" stroke=\"#929aa3\" stroke-width=\"2\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"125\" y=\"165\" width=\"400\" height=\"82\" rx=\"41\" fill=\"#6f35c4\" opacity=\".85\"\u003e\u003c\/rect\u003e\n          \u003crect x=\"525\" y=\"182\" width=\"18\" height=\"48\" rx=\"8\" fill=\"#c6ced5\"\u003e\u003c\/rect\u003e\n          \u003cline x1=\"120\" y1=\"108\" x2=\"540\" y2=\"108\" stroke=\"#ef6f07\" stroke-width=\"3\" marker-start=\"url(#arrEfest)\" marker-end=\"url(#arrEfest)\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"120\" y1=\"118\" x2=\"120\" y2=\"155\" stroke=\"#ef6f07\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"540\" y1=\"118\" x2=\"540\" y2=\"155\" stroke=\"#ef6f07\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"590\" y1=\"160\" x2=\"590\" y2=\"252\" stroke=\"#6f35c4\" stroke-width=\"3\" marker-start=\"url(#arr2Efest)\" marker-end=\"url(#arr2Efest)\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"552\" y1=\"160\" x2=\"585\" y2=\"160\" stroke=\"#6f35c4\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"552\" y1=\"252\" x2=\"585\" y2=\"252\" stroke=\"#6f35c4\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cdefs\u003e\n            \u003cmarker id=\"arrEfest\" markerwidth=\"10\" markerheight=\"10\" refx=\"5\" refy=\"5\" orient=\"auto\"\u003e\u003cpath d=\"M0,5 L10,0 L10,10 z\" fill=\"#ef6f07\"\u003e\u003c\/path\u003e\u003c\/marker\u003e\n            \u003cmarker id=\"arr2Efest\" markerwidth=\"10\" markerheight=\"10\" refx=\"5\" refy=\"5\" orient=\"auto\"\u003e\u003cpath d=\"M0,5 L10,0 L10,10 z\" fill=\"#6f35c4\"\u003e\u003c\/path\u003e\u003c\/marker\u003e\n          \u003c\/defs\u003e\n          \u003ctext x=\"248\" y=\"96\" font-size=\"22\" font-weight=\"900\" fill=\"#ef6f07\"\u003e65.2mm approx.\u003c\/text\u003e\n          \u003ctext x=\"606\" y=\"212\" font-size=\"22\" font-weight=\"900\" fill=\"#6f35c4\" transform=\"rotate(90 606 212)\"\u003e18.5mm approx.\u003c\/text\u003e\n          \u003ctext x=\"182\" y=\"300\" font-size=\"16\" fill=\"#1f2328\"\u003e18650 flat-top cell for compatible holders, chargers, and packs\u003c\/text\u003e\n          \u003ctext x=\"162\" y=\"326\" font-size=\"14\" fill=\"#66707a\"\u003eAlways confirm real fit before use; protected\/button-top cells have different dimensions.\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e12. Pack Scaling Formulas\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eQuick math for series\/parallel planning. Validate finished pack current thermally and electrically.\u003c\/p\u003e\n\u003cp class=\"formula\"\u003ePack Voltage ≈ Series Count × 3.7V\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003ePack Capacity ≈ Parallel Count × 3.0Ah\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003ePack Energy ≈ S × P × 11.1Wh\u003c\/p\u003e\n\u003cbr\u003e\u003cbr\u003e\n\u003cp class=\"formula\"\u003eConservative Pack Current ≈ P × 20A\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e13. Example Parallel Scaling\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eApproximate scaling using 20A continuous product-page rating.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"parallel scaling table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1P\u003c\/th\u003e\n\u003ctd\u003e3.0Ah, 11.1Wh, 20A continuous reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e2P\u003c\/th\u003e\n\u003ctd\u003e6.0Ah, 22.2Wh, 40A continuous reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3P\u003c\/th\u003e\n\u003ctd\u003e9.0Ah, 33.3Wh, 60A continuous reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4P\u003c\/th\u003e\n\u003ctd\u003e12.0Ah, 44.4Wh, 80A continuous reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5P\u003c\/th\u003e\n\u003ctd\u003e15.0Ah, 55.5Wh, 100A continuous reference\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e14. Common Series Voltage Examples\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eNominal voltage examples only. Full-charge and cut-off pack voltages scale separately.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"series voltage examples table\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003e1S\u003c\/th\u003e\n\u003ctd\u003e3.7V nominal \/ 4.2V full \/ 2.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e3S\u003c\/th\u003e\n\u003ctd\u003e11.1V nominal \/ 12.6V full \/ 7.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e4S\u003c\/th\u003e\n\u003ctd\u003e14.8V nominal \/ 16.8V full \/ 10.0V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e5S\u003c\/th\u003e\n\u003ctd\u003e18.5V nominal \/ 21.0V full \/ 12.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e10S\u003c\/th\u003e\n\u003ctd\u003e37.0V nominal \/ 42.0V full \/ 25.0V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003e13S\u003c\/th\u003e\n\u003ctd\u003e48.1V nominal \/ 54.6V full \/ 32.5V cut-off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section dark\"\u003e\n\u003ch2\u003e\u003cspan style=\"color: rgb(255, 255, 255);\"\u003eUse inside a protected lithium-ion electrical system.\u003c\/span\u003e\u003c\/h2\u003e\n\u003cp class=\"muted\"\u003eThe Efest 3000mAh 20A is an unprotected bare 18650. Safe implementation requires a charger\/BMS strategy that respects voltage, current, temperature, and short-circuit limits.\u003c\/p\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e15. Suggested Control Threshold Map\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eSystem-level control guidance for product integration.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"control thresholds\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eCharge upper limit\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e4.20V per cell\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDischarge floor\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003e2.50V per cell\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eContinuous current\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eUse 20A as conservative continuous product-page rating\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePulse current\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eUse 35A only as short burst \/ pulse reference\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eThermal check\u003c\/th\u003e\n\u003ctd\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eStop use if the cell becomes hot; validate pack temperature in enclosure\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e16. Risk-Control Checklist\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eRecommended pack-building and use practices.\u003c\/p\u003e\n\u003cul class=\"checklist\"\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eUse only in devices or packs designed for lithium-ion 18650 cells.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eUse a BMS or controller that monitors voltage, current, and temperature.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eDo not charge above 4.20V or discharge below 2.50V per cell.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eNever carry loose cells with conductive objects such as keys, coins, tools, or metal cases.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eSpot weld for pack assembly; do not solder directly to the cell body.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eInspect wraps and top insulator rings before use.\u003c\/span\u003e\u003c\/li\u003e\n\u003cli style=\"color: rgb(0, 0, 0);\"\u003e\u003cspan style=\"color: rgb(0, 0, 0);\"\u003eValidate busbar, nickel, fuse, wiring, and BMS sizing under real load.\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eBest suited for balanced runtime and high-drain 18650 use.\u003c\/h2\u003e\n\u003cdiv class=\"three-col\"\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eHigh-Output Flashlights\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eGood fit for regulated lights that need both 3000mAh runtime and 20A-class current support.\u003c\/li\u003e\n\u003cli\u003eVerify flat-top compatibility before use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eBattery Packs\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUseful for custom packs requiring balanced energy and current capability.\u003c\/li\u003e\n\u003cli\u003eRequires matched cells, protection, insulation, and pack validation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003ePortable Electronics\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAppropriate for high-current portable systems that provide proper lithium-ion protection.\u003c\/li\u003e\n\u003cli\u003eNot intended for unmanaged loose-cell operation.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eRobotics \/ RC\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCan support short bursts and sustained current loads when cooled adequately.\u003c\/li\u003e\n\u003cli\u003eUse current limiting and temperature monitoring in demanding duty cycles.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eTools \u0026amp; DIY Projects\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eUseful in moderate-power tool and DIY packs where 20A per cell is sufficient.\u003c\/li\u003e\n\u003cli\u003eUse spot welding, not direct soldering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"application-card\"\u003e\n\u003ch3\u003eBackup \/ Energy Modules\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e3000mAh capacity gives useful runtime in compact systems.\u003c\/li\u003e\n\u003cli\u003eHigher-capacity cells may be better when current demand is low.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-grid\"\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e17. Selection Bias: Power vs. Runtime\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003e for shoppers comparing high-power and high-energy cells.\u003c\/p\u003e\n\u003csvg class=\"diagram\" viewbox=\"0 0 680 320\" role=\"img\" aria-label=\"Power versus runtime positioning chart\"\u003e\n          \u003cline x1=\"70\" y1=\"270\" x2=\"630\" y2=\"270\" stroke=\"#b4bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003cline x1=\"70\" y1=\"270\" x2=\"70\" y2=\"50\" stroke=\"#b4bec7\" stroke-width=\"2\"\u003e\u003c\/line\u003e\n          \u003ctext x=\"245\" y=\"304\" font-size=\"15\" font-weight=\"700\"\u003eMore runtime per cell →\u003c\/text\u003e\n          \u003ctext transform=\"rotate(-90 18 175)\" x=\"18\" y=\"175\" font-size=\"15\" font-weight=\"700\"\u003eMore power \/ current →\u003c\/text\u003e\n          \u003ccircle cx=\"330\" cy=\"135\" r=\"16\" fill=\"#6f35c4\"\u003e\u003c\/circle\u003e\n          \u003ctext x=\"356\" y=\"140\" font-size=\"16\" font-weight=\"700\"\u003eEfest 3000mAh 20A\u003c\/text\u003e\n          \u003ctext x=\"266\" y=\"98\" font-size=\"13\" fill=\"#66707a\"\u003eBalanced high-drain position\u003c\/text\u003e\n          \u003ctext x=\"470\" y=\"240\" font-size=\"13\" fill=\"#66707a\"\u003eHigher-capacity energy cells sit further right\u003c\/text\u003e\n        \u003c\/svg\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"chart-card\"\u003e\n\u003ch3\u003e18. Application Suitability Matrix\u003c\/h3\u003e\n\u003cp class=\"caption\"\u003eSimple product-page fit guidance.\u003c\/p\u003e\n\u003ctable class=\"spec-table\" aria-label=\"application suitability matrix\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eHigh-output flashlights\u003c\/th\u003e\n\u003ctd\u003e\u003cspan class=\"badge ok\"\u003eStrong fit\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCustom packs\u003c\/th\u003e\n\u003ctd\u003e\u003cspan class=\"badge ok\"\u003e\u003cspan class=\"badge danger\"\u003eNot recommended\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRobotics \/ RC\u003c\/th\u003e\n\u003ctd\u003e\u003cspan class=\"badge info\"\u003e\u003cspan class=\"badge danger\"\u003eNot recommended\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMaximum runtime per cell\u003c\/th\u003e\n\u003ctd\u003e\u003cspan class=\"badge warn\"\u003e\u003cspan class=\"badge danger\"\u003eNot recommended\u003c\/span\u003e\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUnmanaged consumer devices\u003c\/th\u003e\n\u003ctd\u003e\u003cspan class=\"badge danger\"\u003eNot recommended\u003c\/span\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eSafety, Handling \u0026amp; Compatibility Notice\u003c\/h2\u003e\n\u003cp\u003eThis product is an \u003cstrong\u003eunprotected lithium-ion cell\u003c\/strong\u003e. It should only be used by customers who understand cell-level lithium-ion safety and who are using the battery in compatible hardware, managed packs, or professionally designed assemblies. Improper use can lead to overheating, venting, fire, or explosion.\u003c\/p\u003e\n\u003cul class=\"checklist\"\u003e\n\u003cli\u003eCharge only with lithium-ion chargers or managed battery systems designed for the correct chemistry and cell count.\u003c\/li\u003e\n\u003cli\u003eNever short circuit, crush, puncture, incinerate, or expose the cell to water.\u003c\/li\u003e\n\u003cli\u003eDo not use cells with damaged wraps, dented cans, or missing top insulator rings.\u003c\/li\u003e\n\u003cli\u003eDo not mix with cells of different age, capacity, model, or state of charge in the same pack.\u003c\/li\u003e\n\u003cli\u003eFor assembly, use spot welding rather than direct soldering to reduce heat damage risk.\u003c\/li\u003e\n\u003cli\u003eStore and transport in non-conductive cases; never carry loose cells in pockets or bags.\u003c\/li\u003e\n\u003cli\u003eKeep away from children and from applications for which the product is not specified.\u003c\/li\u003e\n\u003cli\u003eNot for e-cigarette, vape, or similar use.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e\n\u003csection class=\"section\"\u003e\n\u003ch2\u003eCommon technical questions about the Efest 18650 3000mAh 20A.\u003c\/h2\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the capacity?\u003c\/h3\u003e\n\u003cp\u003eThe product is listed as a 3000mAh 18650 cell.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eIs the discharge rating 20A or 35A?\u003c\/h3\u003e\n\u003cp\u003eUse 20A as the conservative continuous-discharge rating. The 35A figure should be treated as a pulse or short burst reference, not a continuous design promise.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eIs this a protected battery?\u003c\/h3\u003e\n\u003cp\u003eNo. This is an unprotected flat-top 18650 cell and should be used only in compatible protected devices or engineered battery packs.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat charger should be used?\u003c\/h3\u003e\n\u003cp\u003eUse a lithium-ion smart charger with a 4.20V CC\/CV profile. Do not use chargers intended for other chemistries.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the discharge cut-off voltage?\u003c\/h3\u003e\n\u003cp\u003eThe product specifications list a 2.50V cut-off voltage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat is the nominal voltage?\u003c\/h3\u003e\n\u003cp\u003eThe product is listed at 3.7V nominal voltage.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat are the approximate dimensions?\u003c\/h3\u003e\n\u003cp\u003eSupporting product specifications list approximately 18.5mm × 65.2mm; the live 18650BatteryStore listing also shows approximately 18.3mm × 65.0mm.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eCan I solder directly to the cell?\u003c\/h3\u003e\n\u003cp\u003eNo. Direct soldering can overheat the cell. Use proper spot welding for battery pack assembly.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eCan I mix this cell with other cells?\u003c\/h3\u003e\n\u003cp\u003eNo. Do not mix brands, capacities, ages, or states of charge in a series or parallel pack. Use matched cells only.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eWhat applications fit this battery best?\u003c\/h3\u003e\n\u003cp\u003eIt is best for protected high-drain 18650 applications such as flashlights, custom battery packs, robotics, portable electronics, and moderate-duty DIY power systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003ch3\u003eCan I carry this battery loose?\u003c\/h3\u003e\n\u003cp\u003eNo. Loose transport is unsafe because conductive objects can short the terminals. Always use a non-conductive battery case.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/section\u003e\n\u003c\/div\u003e","brand":"Efest","offers":[{"title":"Default Title","offer_id":46521701466263,"sku":null,"price":9.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0481\/9678\/0183\/files\/ChatGPT_Image_Jun_17_2026_06_07_59_AM.png?v=1781690902","url":"https:\/\/www.18650batterystore.com\/en-gb\/products\/efest-18650-3000mah-20a-battery","provider":"18650BatteryStore.com","version":"1.0","type":"link"}