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M18 18-Volt Lithium-Ion High Output 12.0Ah Battery Pack

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  • 50% more runtime, most work/charge of any power tool battery
  • 50% more power to replace 15Amp corded tools & runs 50% cooler
  • Fully compatible with the M18 system, featuring over 200+ tools
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Product Overview

The M18 REDLITHIUM HIGH OUTPUT HD12.0 Battery Pack provides 50% more power and runs 50% cooler vs M18 REDLITHIUM HD battery packs. The massive increase in power elevates the performance of the entire M18 system and drives the next breakthrough in M18 FUEL, delivering the power of 15A corded product. It delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before. This HD12.0 battery is the best performing cold weather pack ever made, providing increased power in extreme cold weather conditions (below 0F / -18C). It provides the most work per charge of any professional power tool battery in the industry, driving full corded replacement on the jobsite. The REDLITHIUM HIGH OUTPUT HD12.0 battery is fully compatible with 175+ M18 solutions.
  • REDLINK Intelligence: Our battery circuitry provides optimized performance and overload protection using total system communication between tool, battery and charger
  • Best-in-class construction: Offers long-lasting performance and the best protection against jobsite, weather and environmental conditions
  • Fuel gauge onboard: Displays remaining run-time
  • Versatility: Powers all 175-plus M18 cordless solutions
  • Compatible with all M18 tools
  • 3 year battery warranty
  • Includes: (1) M18 REDLITHIUM HIGH OUTPUT HD12.0 Battery Pack

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Additional Resources

From the Manufacturer

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Product Height (in.)
3.89 in
Product Length (in.)
5.99 in
Product Width (in.)
3.38 in


Battery Amp Hours
12 Ah
Battery Amp Hours
Battery Power Type
Lithium Ion
Charge time (min.)
Color Family
Number of Total Batteries Included
Power Tool Accessory Type
Power Tool Features
No Additional Features
Tools Product Type
Power Tool
Voltage (volts)

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Customer Reviews

  • 4.6
    out of 2,580 reviews
  • 82%recommend this product
Filter by:
Showing 1-10 of 2,580 reviews
Good Quality As Expected
No issues with the mower, started right up and finished the first mow. Now only time will tell how long it will last.
    • Recommended
    This mower is fantastic. Press a button and go....
    This mower is fantastic. Press a button and go. The price is steep. Keep in mind the included batteries make up half of the cost, and you can use them on your other m18 tools. This is a true high quality product.
    • Verified Purchase
    1 found this review helpful
    Buy one, you will not regret it!
    I bought this to replace a failing gas mower. Took a little bit of time to get past the asking price but I decided to go for it and I'm glad I did. It's an awesome mower.Use it to help out a neighbor and tackled her 2' high weeds with no problem and that was after mowing both of my yards! And, it still had 2 of 4 bars lit on the battery meter. I'm becoming a big fan of the Milwaukee FUEL series of tools. Have 4 of them now. If you buy this mower, you will not regret it. Loves the way it stores vertically. Saves space in my storage shed.
    • Verified Purchase
    1 found this review helpful
    Finally…The Milwaukee Mower
    Needing a new mower, I was awaiting this one. First off the price! This is not a cheap mower to invest in compared to others with similar features. It seems to have been made more for the professional than the average homeowner. No assembly required. This is ready to go out of the box. Just Read the book! Start your engine! Have to push down on paddles to start and then to mow. It has decent power, easy to push and cuts well.
      • Recommended
      Over Hyped Very Expensive Product.
      Bought this in Feb 2022. Took it outside at plus 5 celius from my center counsel in my truck 100% charged. place in my M18 Brushless Fuel Drill with an clam ice auger attachment with new blades to test it out. Not that impressed. Drilled two 8" holes at a depth of 28.5" This is all the battery could safely handle as it depleted to one bar. Placed it back in my truck to recharge, have not used it since. Bought it with the 16" chainsaw (still in the box) continued to use my reliable gas chainsaw.
      Response from Milwaukee ToolApr 29, 2022
      Thank you for your review. Please contact us at socialmedia@milwaukeetool.com so we may discuss your concerns with this product further. Thank you. - Cayla
        If it charged correctly
        Won’t charge past 3 bars and this is a relatively new battery. Not what I expect from Milwaukee
          Disappointing at price point.
          This one has highest initial quality 'feel' which by far surpasses all battery powered mowers on the market. It has a ton of power, more than any mower I've ever used. However, cut quality is simply unacceptable at this price point. I borrowed the $400 ego, and while Milwaukee looks and feels a lot better, has more power and higher quality, the cut quality is maybe marginally better than the cheapest EGO and falls far behind my old 5HP Ariens. Lots of stragglers with grass not being lifted.
          Response from Milwaukee ToolApr 27, 2022
          Hello Alex! We appreciate your review of the M18 FUEL Brushless Cordless 21 in. Walk Behind Dual Battery Self-Propelled Mower. We want to investigate your feedback further, Please look out for an email from us. Thanks! -Cayla with Milwaukee Tool
            4 found this review helpful
            Milwaukee mower
            no complaints on Toro I got last summer. Milwaukee is faster not as quiet larger wheels are nice lever to raise
              • Recommended
              1 found this review helpful
              First cut is not acceptable
              Milwaukee Mower appears to be solid and well built but does not cut well. When cutting though thick grass (removing just one inch) the mower does not bog down and it maintains Turbo speed well. However, it will only cut some of the grass, and what it cannot cut, it knocks down uncut. To get a good quality finish cut the thick grass needs to be cut twice (going the opposite direction). This battery powered mover does not do any better of a job than a bottom line regular gas mower but the electric features are nice.
              Response from Milwaukee ToolApr 21, 2022
              Hello! We appreciate you telling us about your experience with the M18 FUEL Brushless Cordless 21 in. Walk Behind Dual Battery Self-Propelled Mower. We will send you an email shortly to further understand the feedback you provided. Thanks!-Cayla with Milwaukee Tool
              • Verified Purchase
              3 found this review helpful
              Goodbye Gas Mowers
              I got the mower in and shipping was not an issue. Pulling the mower out and getting it set up is very intuitive and I didn't have to look at the instructions until the end to verify I had done everything correctly. It's built great and does the job perfectly. It's powerful and fast. 30 min of runtime only took it down one bar. I highly recommend this mower! My only suggestion for improvement would be to add a dust seal for the battery compartment.
                • Recommended
                4 found this review helpful
                Showing 1-10 of 2,580 reviews