Amazon.com : PETZL, CORE Rechargeable Battery for Petzl Headlamps, Compatible with ACTIK, TIKKA and More : Sports & Outdoors
HYBRID concept: the choice of standard batteries or CORE rechargeable battery for your headlamp - Petzl Other
GND 3.7V 900mAh Petzl Core Replacement Battery For Petzl Tikka 2Zipka 2 high quality external Li ion bateria Li Polymer Battery|Mobile Phone Batteries| - AliExpress