Best List: Power Tube 3000 by Mipow
If you’ve ever carried around one of those tube-shaped power packs for your iPhone or iPad, you know the one thing it really needs is a way to tell how much juice is left in the thing.
The Power Tube 3000 provides this in spades, with a simple three-light display on the tube itself and an app that lets you know exactly how much power you have left — and what that translates to in terms of usage.

