April 25, 2026

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There’s no such thing as too many power tool batteries, so when you spot a big discount on a good battery it’s never a bad idea to add it to your collection. Your future self will appreciate the extra juice, as there’s nothing more irritating than stopping work to wait for the LEDs on a charger to light up so you can finish whatever it is you’re working on. Right now, Walmart has a very large discount on a Milwaukee battery that anyone with compatible tools should snag ASAP.

The Milwaukee M12 Redlithium High Output 5.0Ah Battery is on sale for $64, 50% off its original $129 price tag. It’s compatible with over 150 different tools, many of them designed to fit into tight spaces, so they also tend to be quite easy to carry around with you.

This battery has an extended capacity of 5.0Ah and is engineered to deliver 25% more power and run 25% cooler than the otherwise identical non-high output version. It also provides fade-free power and longer runtime than that lesser battery, so it’s great for serious tasks, including those done in frigid conditions (down to 0 degrees Fahrenheit). This toughness extends to the exterior of the battery, where a chemical-resistant housing offers superior protection against oils, greases, and solvents. The bottom line is that this battery is a meaningful upgrade over other M12 Redlithium batteries, one that will make your tools perform better.

Related: Walmart Has a ‘Genuine’ $397 Milwaukee Battery Kit on Sale for 65% Off

Shoppers aren’t afraid to use superlatives to describe this “best in its class battery” that offers the “best bang for the buck” and is the “best M12 battery by a long shot.” One gushed that “it works perfectly with my tools and adds even more power” despite being “quite light and compact.”

Another customer bought this battery after their “lower capacity 2.0Ah batteries were not holding much of a charge any more.” 

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The Milwaukee M12 Redlithium High Output 5.0Ah Battery is a great battery because it makes your tools perform better over a longer period of time. For just $64, it also happens to be a quite inexpensive upgrade to make at the moment, one that anyone with a long chore list and limited time to cross things off of it would do well to add to their arsenal today.

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