Nelson Technologies announces the introduction of the SaFPWR battery case for the iPhone, proudly named the Fusion. The ultra sleek Fusion case is an ultra-light, ultra-thin and extremely durable rechargeable battery case that more than doubles the time of your iPhone 4. This rechargeable iPhone 4 battery case also protects your iPhone from ordinary wear and tear with a low profile design that allows you to keep the original look and feel of your iPhone 4.