There are hundreds of external battery packs available for the iPhone, but only a small subset of those are given the Apple seal of approval and offered in Apple retail stores and the Apple online store. MiPow’s 3,000 mAh Smart Power Tube is one of the newest portable batteries Apple offers, with a lot of perks like built-in charging cables and an accompanying app.
MiPow’s Smart Power Tube is, as the name suggests, tube shaped. While it’s small enough to fit comfortably in a bag or a purse at just over four inches long and an inch thick, it’s an odd shape for a pocket and it isn’t as convenient to use while charging an iPhone like the flatter Mophie-style battery packs. It comes with a little matching carrying pouch so it can be dropped in a bag without worrying about scratches and scuffs.