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If you own any Milwaukee tools, you need a Milwaukee battery (or three or four) to power them up. While batteries can be very expensive, there’s a massive sale going on at Amazon right now. During said sale, you can get a Milwaukee M18 RedLithium High Output Battery Pack for just $108—that’s a savings of 68%, or over $200 off.

As the name suggests, this Milwaukee M18 battery is compatible with any Milwaukee M18 tool. The 18-volt XC8.0 lithium-ion battery pack is especially powerful, with 50% more power in a smaller package than a standard Milwaukee battery. It’s rechargeable and designed to hold up in any conditions, even freezing cold.

A deal this good isn’t going to last long—so take advantage of the incredible savings while you still can. Then check out more of the best Milwaukee tool deals going on right now.