It makes no matter how cool your Smartphone is, the simple fact is once that battery indicator light begins to flash you either need to find a power point or you are going dark until you can charge the battery. The PowerSkin is a case that not only protects the Smartphone from damage such as scratches and marks, but it is also comes with a built in rechargeable battery pack that provides enough power for around 170 minutes of talk time. This PowerSkin has been designed for the Samsung Galaxy S III, but there are versions for all popular Smartphone’s.
Here are some details for the PowerSkin for Samsung Galaxy S III;
PowerSkin battery cases provide power and protection for all day, on-the-go use of your Samsung Galaxy S III. A one-piece silicone, soft-touch case slides and wraps effortlessly around your mobile device, while providing tough, shock-proof protection. With the touch of a button, PowerSkin instantly starts charging up your Samsung Galaxy S III.
The PowerSkin battery case has been priced at $48 (£75)
Source [Power Skin]