With a 2200mAh capacity, Odoyo's Power+Shell EX Rechargeable Battery Case for iPhone 5 ($80) is one of the more powerful Lightning-based battery cases currently on the market. Coming in matte black or glossy white, the design is one we've seen before, with a pop-off frame that enables the iPhone 5 to be installed easily on the charging connector. Fully assembled, Power+Shell EX leaves the iPhone's buttons exposed, while its speaker and microphone…