Unique Gomadic Portable Rechargeable Battery Pack designed for the Panasonic HC-V510 / V520 - High Capacity Gomadic charger that fits in your pocket Very easy to operate. Simply connect Panasonic HC-V510 / V520, 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 Panasonic HC-V510 / V520 (accurate to 0.1v). Specification: Internal Battery (7800mAh lithium polymer), Input port (microUSB), Output Port (Standard USB), Onboard Circuit Design (Panasonic HC-V510 / V520 Specific), Dimensions (2.75 X 3.25 X 0.75 inches), TipExchange enabled (Yes) Elegant, compact design is approximately the size of a standard deck of playing cards. Rugged exterior is built to last and backed by Gomadic Lifetime Warranty Internal circuit protects the Panasonic HC-V510 / V520 from various power ailments including surges, overcharging and short circuiting. Advanced logic maximizes charger efficiency