Lithium Ion Polymer rechargeable battery for the Tikka2 - Zipka2 line of headlamps Designed for the Tikka 2 - Zipka 2 line of headlamps the C O R E battery offers an advantage over regular batteries. It is very easy to insert and can be charged via any standard U S B charger: a cell phone charger a multimedia device cigar lighter charger or even a solar panel a portable energy source a computer etc. Excellent performance at low temperatures thanks to Lithium Ion Polymer technology. Compatible with the entire Tikka2 - Zipka2 line of headlamps Battery life is equivalent to that of more than 900 type L R03/ A A A batteries: the C O R E battery recharges up to 300 times (beyond that its capacity is approximately 30 % lower than its initial capacity) Compatible with all standard U S B chargers (cell phone charger multimedia device cigar lighter solar panel portable energy source computer etc. ) O S by Petzl software personalizes the functioning of the headlamp according to the needs or the type of activity. This software is used to determine the type of lighting: when regulated the light intensity remains constant during use; unregulated it diminishes progressively to optimize battery life. It then becomes possible to adjust in a very intuitive way and with only a few clicks the battery life or the lighting level (maximum or economic mode) as needed. Exclusive mounting system allows the battery to be integrated directly into the Tikka2 - Zipka2 Excellent performance at low temperatures thanks to Lithium Ion Polymer technology Battery charge indicator when in use: - 3 L E Ds lit: charge > 75 %- 2 L E Ds lit: 50 % < charge < 75 %- 1 L E D lit: 25 % < charge < 50 %- No L E Ds lit: charge < 25 % Battery charge indicator when charging: - Constant green L E Ds: charge 100 %- Blinking green L E Ds: 66 % < charge < 100 %- Blinking orange L E Ds: 33 % < charge < 66 %- Blinking red L E Ds: 1 % < charge < 33 %