You already have a trendy protective case for your iPhone, but you want to carry some extra juice for it, too? This is when non-form-fitting battery packs such as the Callpod Fueltank UNO come into play. Unlike the form-fitting juice packs--such as the Mophie packs--the Fueltank doesn't require you to take off the phone's protective case to charge it. However, its downside is that it's not handy to use the phone when it's charging. But that is because the Fueltank UNO isn't an iPhone-only accessory, it supports charging a wide range of devices, and isn't designed with only the iPhone in mind.
The Fueltank UNO supports the same devices as the Callpod Fueltank, which we reviewed. The only difference is that the UNO is just half of the size and weight, merely 3.5 ounces, making it even more portable. It also costs less that the other version, just about $40 compared with the $70 price of the Fueltank.
Out of the box, the Fueltank UNO comes with two adapters, one for the iPhone and iPod Touch, as well as one for other Mini-USB-based-powered devices. You can buy more adapters to charge up to three thousand devices, according to Callpod. However, the adapters are not cheap, costing about $10 each.