The Fenix ARB-L18-3400 is a high capacity 18650 Li-ion rechargeable with a protection circuit in the anode to help prevent short circuits, over charge/discharge and over heating. The battery also includes pressure relief vents which expel waste gas in the rare case of an internal short circuit preventing an explosion.
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Ive used the headlamp on and off for over a year and never charged it. When it finally went dark i was confused as it seemed to have an infinite power source!
Ordered this so I have a charged back-up battery at all times. Came fast. Great solid clear case to store battery.
Son gave me Fenix headlamp with one of these batteries in it. After Hurricane Ian, recharged it, turned on the small low beam, left it on for 5 days and 22 1/2 hours, before it noticeably started dimming.
$20 is pricey for a 18650 battery but it works coming up on 1 month of use.