You need Milwaukee batteries to power your Milwaukee M18 tools. Go with the best and get the 48-11-1822. This is a dual pack of 3-amp hour extended capacity batteries that can keep your tools, lights, and more powered for hours. They come equipped with an onboard fuel gauge, so you can see how much power you have left before they need recharging. They also boast extreme weather performance and fade-free power, so you can work in extremely cold conditions with low fuel and still have your tools working as though freshly charged. The Redlink intelligence is one of the most impressive features of these batteries. It enables communication between the batteries and whichever M18 tool they're plugged into. This communication allows the battery to cut off when the tool is about to draw too much fuel and burn out, keeping your work gear working more efficiently for a longer period. From the workshop to the campsite to the home, make sure you have these Milwaukee batteries on hand to get what you need complete.