The Petzl Accu Core Battery is a Lithium Ion Polymer rechargeable battery for the TIKKA2 - ZIPKA2 line of Petzl headlamps. The CORE battery offers an advantage over regular batteries. It is very easy to insert and can be charged via any standard USB charger: a cell phone charger, a multimedia device, cigar lighter charger, or even a solar panel, a portable energy source, a computer, etc. The Core provides excellent performance at low temperatures, thanks to Lithium Ion Polymer technology and with the OS by Petzl software, the user can customize headlamp performance in a number of ways: for example, to adapt the lighting intensity or battery life to the type of activity.