Today Only: Buy the Seidio SURFACE Plus Case for iPhone 4S and iPhone 4 and Save $20.00! The SURFACE Plus is the right case for those who are looking for sleek protection plus additional battery life for their iPhone 4S or iPhone 4. This case protects your device from scratches while also providing you with up to 6 hours of additional talk time. The newest innovation adds convenience in addition to power and protection. This rechargeable case also allows you to switch out the battery included in the case with a spare battery to continue powering your device.