This battery cube is a must-have for charging your Apple Watch on the go

I like stupid-simple gadgets. Why? Because they're designed to do one thing great instead of a dozen things adequately. 

The Zens Apple Watch Power Bank is just the dead-simple gadget that I've been looking for.

I've been wearing my Apple Watch for over a year now, and while it's slow as molasses for anything but notifications (thankfully, a speed fix via watchOS 3 is on its way) I like it enough that I almost never wear my regular watches anymore.

What I don't like is charging it. No, not charging it magnetically with its included MagSafe puck, but on the go. Read more...