This Mobi Products Cradle with spare battery slot for Palm Pre Plus or Pre let's you easily charge your Smartphone and a spare battery at the same time. Easily synchronize and charge your Palm Pre Plus or Pre with any USB-enabled computer. Just connect the cradle to your computer's USB and you are set. The Smartphone is charged through your computer's USB port. The cradle features a spare battery charger - great to have if you have multiple batteries.