Most modern power tools use lithium-ion batteries. There's a whole host of reasons why these became the industry standard.

The electrical design, of course, is trivial. A computer fan, a switch, and a battery — in this case, a Makita power tool battery. But the Fusion 360 design for the 3D printed parts got a lot of ...

Craftsman has no shortage of tools ... grade cells. And knowing how much power you have is a breeze thanks to the clear 3-LED charge indicator on the front of the battery.