With this portable battery pack from Duracell you can charge mobile phones and other USB devices. It will give you up to three hours of extra talk time on your mobile. It's compatible with iPhone, Blackberry, iPod, most MP3 players and other smartphones.
The sleek, compact design is perfect for back-up power and device charging while travelling or on the move. The device itself is rechargeable via standard USB port. This battery charger comes with a mini USB cable and a micro USB cable.
With battery chargers like this, there is no need for carrying around spare batteries anymore.