21700 cells sport 21mm diameters and are 70mm long, and provide more power density than other Lithium-Ion cells.

Due to an impending labour disruption at Canada Post all orders will be shipped out via alternative methods (FedEx, Purolator, UPS, CanPar).
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21700 Rechargeable Batteries
Products 1 - 4 of 4
Our 21700 Rechargeable Batteries
We stock only the best in 21700 Rechargeable Batteries so you can rest assured knowing you're COEC Equipped.
Fenix 21700 V2 Rechargeable Li-Ion BatteryThe Fenix ARB-L21-5000 V2 is a rechargeable li-ion 21700 battery that provides the voltage and power needed for extended runtime and higher lumen capacities, and in addition to protection in the anode, includes three sets of overheat protection: pressure relief, microporous, and a PTC cathodal block.
Fenix ALF-18 Battery HolderThe Fenix ALF-18 Battery Holder makes your 18650 battery compatible with 21700 flashlights. Simply insert the battery into the holder, et voilĂ ! - your 18650 is now big enough to power 21700 battery compartments.
Fenix 5000 mAh 21700 USB C Rechargeable Li-Ion BatteryWith its 500mAh capactiy, this battery can handle the longer runtimes of flashlights like the TK22, as it has double the power of a standard 18650.
Fenix ARB-L21-6000B USB 21700 BatteryThe Fenix ARB-L21-6000B model Lithium Ion (Li-ion) battery sports a built-In USB-C charging port, and the ability to both charge the battery and pull power from the battery via the port - meaning that the battery can also function as a portable power pack for phones and other devices.