Gomadic Portable AA Battery Pack designed for the Raspberry Pi Board - Powered by 4 X AA Batteries to provide Portable Power. Built using TipExchange Technology Built using the unique Gomadic TipExchange Technology that protects your investment by providing the ability to upgrade charging ports by simply swapping physical connectors. Specification: Input Voltage (4 X AA Batteries), Cable length (6 inches), Dimensions (5.0 X 1.5 X 0.75 inches), Circuit Design (Raspberry Pi Board specific), TipExchange enabled (Yes) Integrated circuitry regulates output voltage specific to the Raspberry Pi Board. Advanced logic maximizes overall charger efficiency. Provides 3 to 10 hours of runtime of your Raspberry Pi (depending on type of batteries installed) This Gomadic Battery Pack is uniquely designed to work with both standard (e.g. alkaline) and/or rechargeable AA batteries.