The Petzl Core Battery can be easily retrofitted to the Tikka and Zipka range of Petzl headtorches to improve battery life. A lithium Ion Polymer battery can be recharged simply using USB ports, and provides the same power output of 900 AAA batteries.A long lasting rechargeable battery for Petzl headtorchesLithium Ion Polymer - equivalent power output to 900 AAA batteriesRetrofitted to Tikka 2 and Zipka 2 rangesUSB rechargeableWorks in all conditionsRecommended activity - camping / travel / climbing