Get more brightness and battery life from your headlamp with the CORE rechargeable battery. It&';s compatible with a variety of Petzl Headlamps and recharges in just 3 hours. Replace your standard batteries with it or charge it up as a backup for longer trips. CORE weighs just 23g. and performs well in low temperatures too. Sustainable source of power compatible with: Tikkid,tikka,zipka,actik,actic core,tactikka & more High Performance core .