MiLi Power iBox Battery Case for iPad 2 ($140)

The first and only battery case get Apple approval license. With 2.1A output which can charge iPad 2 as fast as iPad 2 original charger. Try to find another power pack that looks good, is portable, and extends the power of your iPad 2 all at the same time! Designed to specifically fit with the iPad 2, the iBox securely holds your favorite device in its place, protects it with a structured case, powers it for added portability, and 100% fits with your Smart Cover! Always use it as part of your iPad! No need to take it off for charging or syncing, so your investment would always be more protected, powered, and usable.

• 100% Full iPad 2 Smart Cover Integration - completely compatible with your Smart Cover Licensed made for Apple Mfi plug
• LED power indicator - 4 LED indicators shows power level, each represents 25% of battery usage
• Full access to all existing functionalities of your iPad 2
• Technical Specifications: input - 5V/2.1A (max), output - 5V/2.1A, capacity - 8000 mAh. Self-charging time: 5 hrs
• Only 15.2 mm thick. Product measurements: 256 x 196 x 15.2mm (10.07 x 7.7 x 0.59 inches)
• Powers up to: 10 hours of Video, 15 hours of Data, 10 hours of Music.