littleBits 充電式バッテリー

The rechargeable battery snaps right into my power Bit and runs my little circuits for hours without me swapping anything. Charging it over USB is way less annoying than digging through the junk drawer.

No more hunting for AA batteries every time my kid builds something new. The USB cable tops it up right from my laptop, and one charge lasts through a whole weekend of tinkering.