This makes me wonder if Apple could put a slim battery, similar to the one thats in the phone, in a slim line case, and stick a magnet on it. Think of it like a double or triple thickness credit card. I see all of these extra-charge batteries from Apple, and 3rd parties like an arms race; pack as much battery in an ugly shell that disturbs the ergonomics of the device, and slap a price on it. The case versions of these batteries aren't terrible, but for a company that prides itself on design, the current version for sale, and the prototype, of the magsafe battery pack isn't IT.