A battery operated cell phone charger? What a great idea. Not only a great idea, but a great product. Energizer has done an AWESOME job. I couldn't be happier with this charger. My cell phone battery drains quickly when I'm listening to music on the subway/train commuting. Enegizer's battery operated charger is a GREAT way to charge your phone when on the go and not by an outlet. Just pop the battery in and pick the adapter that fits your phone. (It comes with a variety of adapters.) The adapter for my Blackberry Curve fit PERECTLY. Plug in the adapter to your phone and INSTANT charging. BUY ONE OF THESE!!! Everybody needs one!!!One Happy Customer!