Duracell Powermat PBRB1 Portable Battery with up Double Dattery for Android Devices and iPhone 4/4S-Black Double the battery life of any iPhone, iPod, and most micro-USB-enabled Android devices. Charge anywhere in the palm of your hand with on-the-go power. Can be used for: iPhone iPod Smartphone e-book Reader, bluetooth headset / headphones. Instant backup power for any Micro-USB enabled smartphones. Brand Name Duracell Powermat.