The Extended Battery for your Treo 700w extends your device's talk and use time! It 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 - High Capacity Extended Battery has a capacity of 2400 mAh (approx. 2x more capacity than the standard battery) and conveniently includes a battery cover that is specifically designed for your device.