The petzl core rechargeable battery is a high capacity lithium ion 1250 mah battery that recharges directly with the integrated usb port making it an economical and sustainable solution as the main power supply or as a back up battery for use with petzl s hybrid headlamps this rechargeable battery works well in low temperatures and is compatible with tikkina tikka zipka actik actik core tactikka tactikka and tactikka rgb headlamps