Rechargeable battery compatible with Petzl headlamp in Hybrid Concept version, for Tactikka, Tactikka+, Tactikka Core and Aria lamps. It enables high light output, even at low temperatures. It is charged directly via the integrated USB port. The Core rechargeable battery is an economical solution as a main power pack or second battery. Capacity: 1250 mAh. Charging time: 3.5h. Simple universal charging via the USB port.