This is a lithium ion rechargeable battery for the Petal Performance Headlamp Reactive Plus.High performance in low temperatures.Can be charged via USB port.Please note when using this product with the Tikka R+ and Tica RXP: When setting the headlamp illumination performance with "OS by Petzl", please use a special battery with the "Tikka R" engraved on the battery.The set contents will be stored in the headlamp itself, so you can use this product.