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Fenix ARB-L21-5000U 21700 Rechargeable Battery with Built-In USB. ARB-L21-5000U is a high capacity 21700 Li-ion USB rechargeable battery built for more power and longer runtimes. This battery has its own USB-C charging port for quick/easy charging without the need for a separate charger. Additional features include a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. Pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion. Battery capacity up to 5000mAh. 500 charging cycles. This product will only work in those models supporting 21700 batteries.

THIS BATTERY IS NOT COMPATIBLE WITH 18650 FLASHLIGHTS OR OLDER STYLE CHARGERS. COMPATIBLE CHARGERS ARE THE ARE-A2, ARE-A4, ARE-D1 OR ARE-D2.

Fenix ARB-L21-5000U 21700 Rechargeable Battery with Built-In USB Features:

• 5000mAh high capacity
• USB Type-C rechargeable battery
• Protection circuitry to prevent short circuits
• Pressure vents to prevent explosions
• 500 charge cycles
• Indicator light on battery is red while charging, blue when charged

TK22 V2.0, TK22 UE, and TK30

Fenix ARB-L21-5000U 21700 Rechargeable Battery with Built-In USB Specs:

• Capacity: 5000mAh
• Voltage: 3.6V
• Charging Current: Recommended 1A, maximum 5A
• Uses common USB-C type charging cable (not included)
• Weight: 2.6 ounces (72.5g)
• Size: Length: 2.99? (76mm) Diameter: 0.85? (21.5mm)
• Warranty Period: 12 month from date of purchase

Chargers

Fenix ARE-A4 Four Bay Battery Charger

Fenix ARE-D2 Two Bay Battery Charger

Fenix ARE-A2 Two Bay Battery Charger

Fenix ARE-D1 Single Bay Battery Charger