PowerSkin is offering a series of impact-resistant silicone rubber cases that protect your smartphone while extending your phone’s battery life. The PowerSkin uses XPAL Powered™ battery technology to extend talk time anywhere from 4.5 to 8 hours; the actual capacity of the battery depends on the particular phone. You can charge and sync your phone while also charging the case. Cases are available now for the HTC HD7 and the HTC myTouch 4G through PowerSkin. Cases for iPhone 4 (Verizon & AT&T universal case), HTC Evo, Samsung Galaxy S, Vibrant, i9000 & i9003 and Motorola Droid X will be available in April. Cases will cost $49.99-59.99. If your case isn’t currently available, sign up at PowerSkin to be notified when they are, and you’ll also get a discount code for purchase.