FENIX Fenix 21700 5000mAh USB rechargeable battery

This Fenix 21700 battery can handle twice the power of a standard 18650 battery. The additional mAh allows flashlights such as the PD36R and TK22 to have longer run times. What makes this 21700 battery even better is the USB Type-C charging port built into the cell. You do not need to use a separate charger to charge the battery; everything can be done with a wall adapter and a USB Type-C charging cable. You likely already have these in your home as many cell phones use this same type of charging port.
Specifications:
5000mAh capacity
USB Type-C charging
500 charge cycles
Anode protection circuits
Overcharge protection
Over-discharge protection
Short circuit protection
Overheating protection
3 sets of overheating protection
Overpressure valve
Microporous
PTC cathode block
3.6V
USB charging - USB-A to USB-C cable - Single port charger 1 Amp/2 Amp at 10 Watts max
Maximum output current 8A
Weight: 2.56 oz/72.5 g
Dimensions: 2.99 inches high x 0.85 inches diameter

**USB Cable NOT Included**