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. A USB-C charging cord is NOT included. Important Note:
THIS BATTERY IS NOT COMPATIBLE WITH 18650 FLASHLIGHTS OR OLDER STYLE CHARGERS. COMPATIBLE CHARGERS ARE THE FENIX ARE-A2, ARE-A4, ARE-D1 OR ARE-D2.
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
the batteries work perfectly.
Got the batteries quickly and they work. YEA!
Love having the second battery! Honestly the only complaint I have is that that headlamp battery does not come with the charging port like this one
Hi Melanie - I'm not sure which headlamp you have, but generally speaking, if one of the lights, be it a headlamp, flashlight, bike light or camping lantern, has the charging port on the light itself, the battery inside does NOT have the charging port on it, since it can easily be charged in the light. The 'U' batteries come in the lights
I received the battery quicker than promised, and it meets my needs. The USB-C charging is very convenient.
I'm an inspector and I ordered these to have backups for various flashlights so I don't have down time waiting for batteries to recharge if goes dead due to being lazy and not keeping them charged. They charged right up upon receipt and they're ready to go. I expect these to perform as well as all the other Fenix products I own and use everyday.