Way back in September of last year, Apple filed a patent-infringement suit against HyperMac, the folks behind these external batteries. At the time, it looked like Apple was protecting its patented MagSafe power connector, but a newly released USPTO application for a "Power Adapter with Internal Battery" might reveal a more accurate view of the company's litigious motivations. From the look of things, the outfit intends to make its mark on juicing solutions with what is basically a wall charger packing an internal battery. According to the patent filing, the contraption would include a processor for parceling energy to the host device as well as the adapter, and could also incorporate a supplemental energy source like a solar cell. Among other things, it would also communicate with the device being charged to allow users to monitor the juice stored in the extra battery. If the thing does end up making it to market, it looks like HyperMac could have a whole lot more trouble on its hands than a little patent-infringement suit.