Gomadic High Capacity Rechargeable External Battery Pack for the HTC EVO 4G - Portable Charger with

• Integrated circuitry tailors output voltage and charging current to exact specification of the HTC EVO 4G (accurate to 0.1v).
• Specification: Internal Battery (3400mAh lithium polymer), Input port (miniUSB), Output Port (Standard USB), Onboard Circuit Design (HTC EVO 4G Specific), Dimensions (4.0 X 2.0 X 0.5 inches), TipExchange enabled (Yes)
• Very easy to operate. Simply connect HTC EVO 4G, press activation button on pack, and charging begins. Quick start guide included.
• Built with high capacity lithium polymer rechargeable battery technology (17 Wh / 3400 mAh) in a compact design.
• 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

This charger works as advertised. I have used it in airports and on the shuttle bus. Also used it on a long business day where my EVo would have gone dead. Highly recommended.

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