Powerful Lithium Polymer Rechargeable Gomadic Brand Battery Pack High Capacity Portable Charger Compatible with Palm LifeDrive with upgradeable TipExchange Technology Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Palm LifeDrive Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Very easy to operate. Simply connect Palm LifeDrive, press activation button on pack, and charging begins. Quick start guide included. Integrated circuitry tailors output voltage and charging current to exact specification of the Palm LifeDrive (accurate to 0.1v). Designed with a front facing LED display that clearly display the current battery capacity at the touch of a button Internal circuit protects the Palm LifeDrive from various power ailments including surges, overcharging and short circuiting. Advanced logic maximizes charger efficiency.