ARB-L21-5000 is an outstanding high-capacity 21700 Li-ion USB rechargeable battery. It's engineered to deliver more power and offer longer runtimes, making it a reliable energy source. This battery comes with a protection circuit on the anode. This crucial feature helps prevent short circuits, overcharging, over-discharging, and overheating, ensuring safe and stable performance. There are also pressure relief vents. In the rare event of an internal short circuit, these vents expel waste gas, effectively preventing an explosion. With a battery capacity of up to 5000mAh and 500 charging cycles, it provides long - lasting use. Please note that this product only works in models supporting 21700 batteries. It's not compatible with 18650 flashlights or older - style chargers. Compatible chargers include the ARE - A2, ARE - A4, ARE - D1, or ARE - D2. The battery has an indicator light that turns red while charging and blue when fully charged. Currently, it's compatible with many models such as the HT18, LR35R, PD36R, PD40R V2.0, TK22 V2.0, TK22 UE, and TK30, as well as others like the E35 V3.0, LR50R, PD36 TAC, Tk16 V2.0, and TK20R V2.0. Specifications: Capacity: 5000mAh, Voltage: 3.6V, Recommended Charging Current: 1A (maximum 5A), Weight: 72.5g, Size: Length 76mm, Diameter 21.5mm.






Using your Fenix 5000mAh 21700 rechargeable battery is easy. First, make sure you're using a compatible charger like the ARE - A2, ARE - A4, ARE - D1, or ARE - D2. When you plug the battery in to charge, the indicator light will turn red. Wait until it turns blue, which means it's fully charged. This battery is only for models that support 21700 batteries, so don't try to use it in 18650 flashlights or older chargers. For maintenance, keep the battery in a cool and dry place. Avoid exposing it to extreme temperatures or physical damage. Also, don't overcharge or over - discharge the battery. If you follow these steps, your battery should last through its 500 charging cycles and keep powering your devices effectively.