Looking for protection and power? OtterBox has you covered. The OtterBox Defender Series With ION Intelligence for iPhone 4S/4 will give you rugged protection and keep your device powered with twice the juice.
If you're looking for a case that's built like a tank/submarine hybrid, the OtterBox Armor series may be just what you need. This is a tough and rugged waterproof case for the iPhone 5 or 4/4S.