The Seidio Extended Battery is a premium product and designed for experienced users, who understand importance of quality for long battery life and safety of everyday use. This Super Extended 3500 mAh Battery will give your Samsung/ Google Nexus S 4G power when it needs it. The Super Extended Battery is designed specifically for your Samsung/ Google Nexus S 4G. This extended battery is great if you want to maximize the features of your Samsung/ Google Nexus S 4G. Once you try the Super Extended Battery, you'll never look back. Its superior performance improves run time, often doubling that provided by the original brand replacement. The superior quality results in longer battery life and better protection of the powered device. This extended battery comes with an extended battery door. It has double the capacity of the original battery and comes with a black replacement door featuring Seidio's signature soft touch coating. Even with heavy phone and data usage, this battery will keep you charged and ready to go.