Entering a relatively rare accessory category for the iPad 2, Mipow has released a new tablet battery case called Juice Cover for iPad 2 ($99). Like numerous cases we've seen in the past for iPhones and iPods, Juice Cover packs a rechargeable cell into what looks like a standard rear shell; it's slimmer than we would have expected from a 6,000mAh battery. The shell clips onto the back of the tablet, with a Dock Connector plug fitting into the bottom…
