Increase your productivity with the Milwaukee battery HotSwap! This 3D Printed device takes 2 Milwaukee M18 XC batteries and attaches them facing opposite directions to allow you to quickly change between them. This allows you to have 2 fully charged batteries on your drill or impact driver! The HotSwap easily slides onto each battery but keeps a firm grip thanks to the rubber bottom on the battery. Each HotSwap also has 4 slots on the back to let you hang it anywhere with nails or screws. The HotSwap is perfect whether your working on the job or at home!