Powerful Lithium Polymer Rechargeable Gomadic Brand Battery Pack High Capacity Portable Charger Compatible with Panasonic HC-V750 / V750 with upgradeable TipExchange Technology Integrated circuitry tailors output voltage and charging current to exact specification of the Panasonic HC-V750 / V750 (accurate to 0.1v). Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Panasonic HC-V750 / V750 Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Very easy to operate. Simply connect Panasonic HC-V750 / V750, press activation button on pack, and charging begins. Quick start guide included. Internal circuit protects the Panasonic HC-V750 / V750 from various power ailments including surges, overcharging and short circuiting. Advanced logic maximizes charger efficiency Continue to use your Panasonic HC-V750 / V750 for hours OR recharge it on the go without being tethered to a wall outlet