Convergence devices are great and all, but how many of them are actually useful? Methinks the One Battery Emergency Mobile Charger Torch tries too hard, as it seems to place the humble AA battery on a sky high pedestal. Sure, you can slot in an AA battery inside, which the manufacturer claims is enough to power your cell phone battery for an additional hour to two of talktime - perfect for those emergency moments. Each $21.50 purchase will come with five tips for Nokia, Samsung, and Sony Ericsson handsets among others. If you don’t have any dead batteries to charge, you can always use it to annoy your friends with the built-in torchlight function.