iZap Battery Extender - Lithium Ion Battery triples battery life. Triple Your iPod or iPhone Battery Life - Fits like a glove Works with your iPhone and iPod 30G/60G/80G too!!! A must have for iPod and iPhone video users. Add hours of time with this slim lithium ion battery extender. Charge the iZap battery extender via USB 5 hour charging time. Adds 10 hours of play time to your ipod, or triple the battery life of your iphone