TENPOWER 50XG 21700
5000mAh / 90A-Class
High-output 5.0Ah 21700 lithium-ion cell designed for professional pack builders who need high capacity, very low internal resistance, and high-current capability in a compact cylindrical format.
TENPOWER 50XG 21700 5000mAh 90A Battery
The TENPOWER INR21700-50XG is a high-power 21700 cell positioned for demanding battery-pack applications that need high current, high runtime, and low voltage sag. Its specification lists 5000mAh nominal capacity, 4950mAh minimum capacity, very low ≤4mΩ AC impedance, and multiple current tiers for different operating conditions.
For professional product-page accuracy, the current rating is presented in layers: 40A continuous discharge without temperature cutoff, 90A continuous discharge with a 75°C temperature cutoff, and 140A pulse discharge for 3 seconds. The 90A number should be treated as a thermally constrained high-current rating, not as an unrestricted continuous design target.
| Brand / Model | TENPOWER INR21700-50XG |
|---|---|
| Cell Type | 21700 cylindrical rechargeable lithium-ion cell |
| Nominal Capacity | 5000mAh |
| Minimum Capacity | 4950mAh after standard charge and 0.2C discharge to 2.5V |
| Nominal Voltage | 3.6V |
| Charge Voltage | 4.20V; product listing notes 4.25V maximum |
| Discharge Cut-Off Voltage | 2.50V |
| Standard Charge | 2.5A / 0.5C CCCV to 4.2V, 100mA cut-off |
| Maximum Charge Current | 15A |
| Maximum Continuous Discharge | 40A without temperature cut-off; 90A with 75°C temperature cut-off |
| Pulse Discharge Current | 140A for 3 seconds |
| Cycle Life | ≥60% initial capacity after 500 cycles under 6A charge and 40A discharge to 2.5V or 75°C cut-off |
| Internal Impedance | ≤4mΩ AC at 1000Hz, 25±3°C, 30% SOC |
| Operating Ambient Temperature | Charge: 0°C to 45°C; Discharge: -20°C to 60°C |
| Cell Surface Temperature | Charge: 0°C to 60°C, recommended recharge release <45°C; Discharge: -20°C to 80°C, recommended re-discharge release <60°C |
| Storage Temperature | 1 year: -20°C to 25°C; 3 months: -20°C to 45°C; 1 month: -20°C to 60°C |
| Storage Humidity | ≤60% |
| Ex-Factory State | Below 30% charge; OCV 3.50V to 3.59V within 90 days from shipping date at 15°C to 30°C |
| Dimensions | 21.50mm max diameter × 70.50mm max height |
| Weight | 71.0g max |
| Protection | No — unprotected flat-top cell; use device-level or pack-level protection |
Electrical operating envelope at a glance.
These quick-reference visuals summarize the 50XG’s current tiers, voltage range, capacity-to-energy translation, and C-rate conversion.
1. Current Capability Stack
Pulse, thermally constrained, no-temp-cutoff, and charge-current reference points.
2. Voltage Operating Window
Basic per-cell voltage limits for charger, BMS, and system-control logic.
3. Capacity and Energy Translation
Nominal watt-hours are estimated from capacity and nominal voltage.
4. C-Rate Conversion
The 50XG specification defines 1C as 5000mA.
| 1.0A | 0.2C standard discharge current |
|---|---|
| 2.5A | 0.5C standard charge current |
| 15A | 3C maximum charge current |
| 40A | 8C no-temperature-cutoff continuous discharge rating |
| 90A | 18C continuous discharge with 75°C temperature cut-off |
| 140A | 28C pulse discharge for 3 seconds |
High-current output should be evaluated with thermal cut-off, voltage sag, and pack resistance in mind.
The 50XG rate-discharge table covers 0.2C, 10A, 20A, 30A, 40A, and 50A discharge to 2.5V after standard charge. The highest advertised current levels extend beyond that table and are controlled by thermal conditions: 90A is specified with a 75°C temperature cut-off, and 140A is a 3-second pulse rating.
The simplified discharge graph below visualizes voltage versus delivered capacity under light, high, and thermally constrained loading. It is intentionally simplified for product-page clarity and is not a digitized laboratory discharge trace.
Rate capability summary
| 0.2C / 1A | 100% relative capacity reference |
|---|---|
| 10A | 94% relative capacity |
| 20A | 95% relative capacity |
| 30A | 95% relative capacity |
| 40A | 93% relative capacity |
| 50A | 92% relative capacity |
| 90A | Thermally constrained rating with 75°C cut-off; validate in final pack |
5. Simplified Discharge-Curve Graph
Voltage vs. capacity illustration for 1A, 40A, 50A, and 90A thermally constrained operation. Simplified for product-page visualization.
6. Estimated IR Voltage Drop
Using the published ≤4mΩ AC impedance as a rough order-of-magnitude planning reference. Real DC sag includes the full pack current path.
7. Rate Capability Bar Chart
Relative capacity by discharge current under the specification’s rate-discharge test table.
8. Thermal Cut-Off Rating Map
Simple explanation of the three current tiers: no-temp-cutoff, thermally constrained, and pulse.
Charge, temperature, cycle life, and storage should be managed as one system.
The 50XG specification includes standard charge, maximum charge, rate-discharge capability, discharge-temperature capacity, cycle-life, storage, and ex-factory voltage criteria. These condensed diagrams make the major operating limits easier to understand.
9. Charge Profile Reference
Standard charge is 2.5A CCCV to 4.20V with 100mA cut-off; maximum charge current is 15A.
10. Thermal Operating Envelope
Ambient operating range and cell-surface limits from the TENPOWER specification.
11. Temperature Discharge Capacity
Relative capacity at 30A discharge across temperature after standard charge.
12. Cycle-Life Visualization
Published cycle-life criterion: ≥60% initial capacity after 500 cycles using 6A charge and 40A discharge to 2.5V or 75°C cut-off.
13. Storage Performance
Published storage and recovery criteria for inventory and pack-management planning.
| 1-Year Storage | -20°C to 25°C at ex-factory status |
|---|---|
| 3-Month Storage | -20°C to 45°C at ex-factory status |
| 1-Month Storage | -20°C to 60°C at ex-factory status |
| Storage Humidity | ≤60% |
| Hot Storage Recovery | After standard charge and 60±3°C storage for 30 days, capacity recovery ≥90% under the specified method. |
| Ex-Factory OCV | 3.50V to 3.59V within 90 days from shipping at 15°C to 30°C |
14. Safety Design Summary
Product-page engineering reminders for high-power bare-cell integration.
| Electrical Control | Use BMS/controller limits for over-charge, over-discharge, over-current, and short-circuit protection. |
|---|---|
| Thermal Control | Temperature sensing is critical when designing anywhere near the 75°C or 80°C surface-temperature regions. |
| Mechanical Control | Use spot welding and avoid damage to wrap, insulator ring, vent, and can. |
| Pack Qualification | Validate current sharing, busbar heating, fuse behavior, BMS MOSFET heat, and cell-surface temperature under real load. |
21700 dimensional envelope for holders, tab welding fixtures, and pack CAD.
Mechanical fit is especially important in dense high-current packs. Use the maximum envelope for holder clearance, weld fixture design, insulation planning, and battery-pack CAD.
15. Cell Dimension Diagram
Mechanical envelope based on the 50XG specification with tube.
16. Pack Scaling Formulas
Quick math for series/parallel planning. Validate current limits thermally and electrically.
Pack Voltage ≈ Series Count × 3.6V
Pack Capacity ≈ Parallel Count × 5.0Ah
Pack Energy ≈ S × P × 18.0Wh
Conservative Continuous Current ≈ P × 40A
17. Example Parallel Scaling
Approximate scaling using 40A no-temp-cutoff current reference, with 90A temp-cut current shown separately.
| 1P | 5.0Ah, 18.0Wh, 40A no-temp-cut / 90A temp-cut reference |
|---|---|
| 2P | 10.0Ah, 36.0Wh, 80A no-temp-cut / 180A temp-cut reference |
| 3P | 15.0Ah, 54.0Wh, 120A no-temp-cut / 270A temp-cut reference |
| 4P | 20.0Ah, 72.0Wh, 160A no-temp-cut / 360A temp-cut reference |
| 5P | 25.0Ah, 90.0Wh, 200A no-temp-cut / 450A temp-cut reference |
18. Common Series Voltage Examples
Nominal voltage examples only. Full-charge and cut-off pack voltages scale separately.
| 1S | 3.6V nominal / 4.2V full / 2.5V cut-off |
|---|---|
| 3S | 10.8V nominal / 12.6V full / 7.5V cut-off |
| 4S | 14.4V nominal / 16.8V full / 10.0V cut-off |
| 5S | 18.0V nominal / 21.0V full / 12.5V cut-off |
| 10S | 36.0V nominal / 42.0V full / 25.0V cut-off |
| 13S | 46.8V nominal / 54.6V full / 32.5V cut-off |
Use the 50XG inside a temperature-monitored, current-limited electrical system.
This is a high-power unprotected cell. Proper implementation requires pack-level protection and host-device control for voltage, current, temperature, and short-circuit fault conditions.
19. Suggested Control Threshold Map
System-level control guidance derived from the TENPOWER specification.
| Charge upper limit | 4.20V per cell; never exceed the stated maximum charge-voltage limit |
|---|---|
| Discharge floor | 2.50V per cell |
| Standard charge | 2.5A CCCV to 4.20V, 100mA termination |
| Maximum charge | 15A, subject to thermal validation and pack-level limits |
| Conservative continuous discharge | 40A without temperature cut-off |
| Thermally constrained discharge | 90A with 75°C cut-off; design must monitor temperature |
| Pulse current | 140A for 3 seconds only |
| Protection requirements | Pack and host should include over-charge, over-discharge, over-current, over-heat, and short-circuit protection. |
20. Risk-Control Checklist
Recommended pack-building and use practices.
- Use only in devices or packs designed for high-current 21700 lithium-ion cells.
- Use a BMS or controller that monitors voltage, current, and cell temperature.
- Do not charge above 4.20V or discharge below 2.50V per cell.
- Validate high-current operation under the actual enclosure, cooling, and load profile.
- Never carry loose cells with conductive objects such as keys, coins, tools, or metal cases.
- Spot weld for pack assembly; do not solder directly to the cell body.
- Inspect wraps and top insulator rings before use.
- Size busbars, nickel, tabs, fuses, wiring, and BMS MOSFETs for both electrical resistance and heat rise.
Best suited for professional high-power systems where both current and capacity matter.
Power Tools
- Strong candidate for high-output tool packs with heavy current draw.
- Low impedance helps support voltage stability under demanding loads.
EV / E-Bike Packs
- Useful for high-performance mobility packs with proper BMS, fusing, and cooling.
- Parallel count should be selected from measured current, voltage sag, and heat rise.
Robotics / Automation
- Supports motor-driven systems that require high power and compact energy storage.
- Thermal validation is required under peak loads.
High-Current Electronics
- Suitable for engineered electronics that need high surge capability and stable voltage.
- Use only with proper protection and current limiting.
Energy Storage Modules
- Can be used where 5000mAh capacity and higher current capability are both valued.
- ESS designs should prioritize conservative current, temperature control, and long-term service life.
Custom Battery Packs
- Designed for experienced builders and integrators who can manage current sharing and heat.
- Requires matched cells, correct welding, insulation, protection electronics, and pack-level testing.
21. Selection Bias: Power vs. Runtime
for shoppers comparing high-power and high-energy cells.
22. Application Suitability Matrix
Simple product-page fit guidance.
| Power tools | Strong fit |
|---|---|
| Performance mobility packs | Strong fit with BMS and thermal design |
| Robotics / automation | Strong fit with validation |
| High-current electronics | Strong fit when engineered correctly |
| Maximum runtime only | Compare against energy-focused cells |
| Unmanaged consumer devices | Not recommended |
Safety, Handling & Compatibility Notice
This product is an unprotected lithium-ion cell. It should only be used by customers who understand lithium-ion cell 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.
- Charge only with lithium-ion chargers or managed battery systems designed for the correct chemistry and cell count.
- Never short circuit, crush, puncture, incinerate, or expose the cell to water.
- Do not use cells with damaged wraps, dented cans, or missing top insulator rings.
- Do not mix with cells of different age, capacity, model, or state of charge in the same pack.
- For assembly, use spot welding rather than direct soldering to reduce heat damage risk.
- Store and transport in non-conductive cases; never carry loose cells in pockets or bags.
- Keep away from children and from applications for which the product is not specified.
- Not for e-cigarette, vape, or similar use.
Common technical questions about the TENPOWER 50XG.
What is the capacity of the TENPOWER 50XG?
The nominal capacity is 5000mAh, and the minimum capacity is 4950mAh under the standard charge and 0.2C discharge test method.
Is this a 40A or 90A battery?
Both ratings appear in the specification, but they refer to different conditions. The 40A rating is the maximum continuous discharge without temperature cut-off. The 90A rating is maximum continuous discharge with a 75°C temperature cut-off, so it requires careful thermal validation.
What is the pulse current rating?
The specification lists 140A pulse discharge for 3 seconds. This is a short transient rating, not a sustained continuous current rating.
Is this a protected battery?
No. This is an unprotected flat-top 21700 cell and should only be used in equipment or packs with appropriate voltage, current, short-circuit, and temperature protection.
What charger should be used?
Use a lithium-ion charger or battery-management system that uses a CCCV profile to 4.20V per cell. The standard charge current is 2.5A with 100mA termination, while the maximum charge current is listed as 15A under appropriate design controls.
Can the 50XG fast charge?
Yes. The specification lists a maximum charge current of 15A. High-current charging should be used only in systems with temperature monitoring, pack-level protection, and validated thermal behavior.
What is the correct discharge cut-off voltage?
The specification states a 2.50V discharge cut-off voltage per cell. Many pack designers choose a higher system cut-off to reduce stress and improve service life.
Can the 50XG be used in battery packs?
Yes. It is designed for professional battery pack integration when cell matching, spot welding, thermal monitoring, fusing, BMS sizing, insulation, and current sharing are properly engineered.
Can I solder wires directly to this cell?
Direct soldering is not recommended. Spot welding is the preferred pack-assembly method because it reduces the risk of heat damage to the cell.
What are the cell dimensions?
The maximum published dimensions are 21.50mm diameter and 70.50mm height. Always confirm fit in the actual device, holder, or pack fixture.
What temperature range is allowed?
The ambient operating range is 0°C to 45°C for charging and -20°C to 60°C for discharging. Cell-surface temperature limits extend to 0°C to 60°C for charging and -20°C to 80°C for discharging, with recommended release temperatures below 45°C and 60°C respectively.
What does ≤4mΩ internal impedance mean?
It indicates very low AC internal resistance at 1kHz, which supports high-current behavior and helps reduce voltage sag. Real pack resistance also includes welds, nickel, busbars, wiring, fuses, holders, and BMS components.
How many cycles should I expect?
The specification gives a cycle-life criterion of at least 60% capacity retention after 500 cycles using 6A charge and 40A discharge to 2.5V or 75°C cut-off under room-temperature conditions. Actual service life depends on charge rate, discharge current, temperature, depth of discharge, and pack design.
What is the shipment voltage?
The specification states that the cell should ship below 30% state of charge, with OCV from 3.50V to 3.59V within 90 days from shipping at 15°C to 30°C.
Can I carry this battery loose?
No. Loose transport is unsafe because conductive objects can short the terminals. Always use a non-conductive battery case.