The ElectraSpan? Extended Battery for your Dopod 818 extends your device's talk and use time! The ElectraSpan is a high capacity rechargeable lithium ion (Li-Ion) battery that is specifically designed for your device - perfect for busy people on the go, and for those who use their phone and data heavily. Now you can extend the use of your device between charges! BoxWave?s ElectraSpan Extended Battery not only provides a high capacity of power, but also conveniently includes a battery cover specifically designed for your device.