By Todd Bernhard
I'm always on the lookout for a good battery-charging phone case, and I have several criteria that I look for. First, it should at least double the battery life of my iPhone, or it's not worth it. Next it should provide good protection—after all, it's a case. And ideally it should do so without adding too much bulk or cost. A bonus would be if it could use a Lightning cable instead of microUSB—it's a rare feature, but it means one less cable to carry.