Wow this is a cool new unexpected item from Milwaukee Tools. Now you can use your Milwaukee M12 batteries to charge other devices such as a cell phone, ipods, iphones, laptops(?) or any other device that would work off a USB or car charger. They claim to be able to charge 5 small electronic devices (two at a time) with the new Power Pack unit. Awesome addition to the line up guys! Rest assured it will be available shortly at Ohio Power Tool.