A 21700 battery is a type of lithium-ion rechargeable battery. The numbers "21700" refer to the battery's dimensions: it is 21mm in diameter and 70mm in length. 21700 batteries are commonly used in high-performance applications such as electric vehicles, power tools, and high-powered flashlights. They offer a higher capacity than 18650 batteries and are known for their high energy density, long lifespan, and relatively low self-discharge rate. They are becoming more popular in recent years, and many electronic devices that used to use 18650 batteries are now transitioning to use 21700 batteries.
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Epoch Batteries
Epoch 21700 5000mAh 10A - Button Top Battery (50G)
Sale price$8.25
Regular price$12.99
In stock

Nitecore
Nitecore NL2150HP 21700 5000mAh 15A - Protected Button Top Battery
Sale price$24.95
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Samsung
Epoch Batteries 3.6V 1P1S 5000mAh 5A Battery Pack - PCB and 6" Leads
Sale price$12.99
In stock