Fenix 5000 mAh Battery

Specifications of the ARB-L21-5000 Rechargeable Battery
New 21700 battery type
5000mAh high capacity
Protection circuitry to prevent short circuits
Pressure vents to prevent explosions
500 charge cycles
Currently compatible with the E35 V3.0, HT18, LR35R, LR50R, PD36R, PD36 TAC, PD40R V2.0, TK16 V2.0, TK20R V2.0, TK22 UE, and TK30.
Capacity: 5000mAh
Voltage: 3.6V
Charging Current: Recommended 1A, maximum 5A
Weight: 2.6 ounces (72.5g)
Size: Length: 2.99″ (76mm) Diameter: 0.85″ (21.5mm)
Warranty Period: 12 month from date of purchase