Motorola Power Pack 3000 Portable Battery, Built-In Micro USB Cable, Black

Product Review

External battery for cellphone/tablet. 4000 mAh Amps: 1.5

Power On the Go: It?s small and lightweight, yet can provide up to 5 hours of additional talk time
CarbonFree: Through an alliance with the Carbonfund.org, Motorola has offset the energy used to manufacture, distribute and use
Charge up to two devices simultaneously with the built-in micro-USB cable and USBA port. Devices can include mobile phones, Bluetooth headsets, and MP3 players like the iPod.
Automatically powers down to save battery life when no devices are detected or when a device is fully charged.