The Energio SLIM is a portable charger that really sleek and compact. Forget the big bulky battery packs that are fat and ugly. The Energio SLIM fits into your pocket easily so that you can carry it anywhere you go. It also comes with a built-in cable so that you don't have to carry an extra cable for charging your cell phone. With it's polished aluminium finishing, it looks great and classy. You can carry it around as a great looking accessory that looks perfectly good with your cell phone. With the Energio SLIM you will never have to worry about your cell phone ever getting flat again. external battery charger