Breakdown the difference between Milwaukee M12 and M18 battery packs.

Ultimate Guide to Milwaukee M12 & M18 Compatibility

The Milwaukee M12 & M18 batteries are known to provide more power, runtime, and speed than your average lithium-ion Battery. With an extensive line of cordless tools, it can be hard to determine which Battery is compatible with each tool. Let’s break it down:

M12 & M18 Batteries Explained

The difference between an M12 and an M18 battery comes down to size, weight, and comparability. We previously posted an in-depth explanation, check out Milwaukee M12 and M18 Batteries to learn more.

Which Battery Pack Do I Need?

CP Batteries

Milwaukee M12 and M18 CP Battery

The lightweight Milwaukee CP batteries, or compact batteries, have 5 Li-ion cells. They are available for M12 and M18 tools. The Battery offers a faster charge time and is designed for jobs that require a light demand and repetitive tasks. Screw Guns, Cable Cutters, and Drain Snakes are a few tools that fit into this category. See the reference chart below for more details.

XC Batteries

Milwaukee XC Battery M12 M18

Milwaukee XC batteries, or extended capacity batteries, have 10 Li-ion cells. They are also available for M12 and M18 tools. This pack is designed for more runtime and power to create high performance for all demands. Hammer Drills, Jig Saws, and Underhood Lights are a few tools that fit into this category. See the reference chart below for more details.

HD Batteries

Milwaukee HD Battery M12 M18

The Milwaukee HD battery, or High Demand battery, has 15 Li-ion cells. These packs are exclusive to the M18 tool line. The HD battery provides the best performance for high demand applications. Rotary Hammers, Right Angle Drills, and String Trimmers are a few tools that fit into this category. See the reference chart below for more details.

M12 & M18 Battery Chart

MIlwaukee Battery Pack Compatibility

Now that you’re familiar with the difference, are you ready to find the Milwaukee Tools for the job? You’ll find the right tool and the right deal at Acme Tools.

Battery Reference Chart

Refer to the table below for battery compatibility.

PART NUMBERDESCRIPTIONBATTERY TYPE
48-11-2401M12™ REDLITHIUM CP 1.5Ah BATTERY PACKCP
48-11-2411M12™ REDLITHIUM CP 1.5Ah BATTERY 2-PACKCP
48-59-2420M12™ CP 2.0Ah STARTER KITCP
48-11-2402M12™ XC 2.0Ah BATTERY PACKCP
48-11-2420M12™ REDLITHIUM CP 2.0Ah BATTERYCP
48-11-2430M12™ REDLITHIUM CP 3.0Ah BATTERY PACKCP
48-11-2412M12™ REDLITHIUM XC 3.0Ah BATTERY 2-PACKXC
48-11-2440M12™ REDLITHIUM XC 4.0Ah BATTERYXC
48-11-2460M12™ REDLITHIUM XC 6.0Ah BATTERY PACKXC
48-11-1820M18™ REDLITHIUM CP 2.0Ah BATTERYCP
48-11-1835M18™ REDLITHIUM HIGH OUTPUT CP 3.0Ah BatteryCP
48-59-1850M18™ XC 5.0Ah STARTER KITXC
48-11-1850M18™ REDLITHIUM XC 5.0Ah BATTERY PACKXC
48-11-1865M18™ REDLITHIUM HIGH OUTPUT XC 6.0Ah BATTERY PACKXC
48-11-1862M18™ REDLITHIUM HIGH OUTPUT XC 6.0Ah BATTERY 2-PACKXC
48-11-1880M18™ REDLITHIUM HIGH OUTPUT XC 8.0Ah BATTERYXC
48-59-1890M18™ REDLITHIUM HD 9.0Ah STARTER KITHD
48-11-1890M18™ REDLITHIUM HD 9.0Ah BATTERY PACKHD
48-11-1812M18™ REDLITHIUM HIGH OUTPUT HD 12.0Ah BATTERY PACKHD
48-59-1200 M18™ REDLITHIUM HIGH OUTPUT HD 12.0Ah BATTERY STARTER PACKHD

FAQ

Are The Batteries Interchangeable?

No, the batteries are not interchangeable. M12 batteries are compatible with M12 tools only, and M18 batteries are compatible with M18 tools only.

How Long Does it Take to Charge the Battery?

Refer to the chart below for charge times.

Do Milwaukee Batteries Have a Lifetime Warranty?

No, the battery packs do not have a lifetime warranty. However, the battery packs will be replaced or repaired if they are defective in material or workmanship. The warranty date ranges from 2 to 3 years.

Source: https://www.milwaukeetool.com/Support/Registration-and-Warranty

23 Comments

  • George Krauskopf

    September 27, 2020 at 10:14 pm

    I own a Milwaukee Impact Wrench w/ M18 battery; Please tell me which battery operated circular saws are compatible with the M18 battery:

    Thank you for reading and responding promptly to my query.

    Regards
    George

    (Comment edited to remove incorrect spelling and personal information)- Acme Tools

    Reply
  • Ashton Winnik

    March 1, 2021 at 2:03 pm

    Hey, if I may, the m12 standard output is 3 18650 cells and the xc is 6 18650 cells. To achieve 12 volts they are multiples of three, for the m18 to hit 18 volts it will always be a multiple of 5

    Reply
    • Acme Tools

      March 30, 2021 at 7:55 am

      Hi Jay, Thank you for your question. There is not a M18 to M12 adapter. If you are looking to use M12 tools you will need a Milwaukee M12 battery.

      Thank you,
      Acme Tools

      Reply
      • yo

        February 8, 2023 at 12:04 pm

        thats bs !!! they need to make a m18 to m12 adpter with step down voltage resistor .. give me a brake with the cost of these batteries … im going dewalt …one battery stock for all tools . boycott milwaukee untill they get there sh-t toghether !!!!

        Reply
        • Acme Tools

          February 8, 2023 at 4:31 pm

          Thank you for your comment. We can understand your frustration, but the voltage of the tools are designed based on performance. Many manufacturers, including DEWALT, do the same with their 20V MAX and 12V MAX tools.
          Thank you, Acme Tools

          Reply
    • Rod Uy

      April 7, 2022 at 10:29 am

      I’m working on Husqvarna yth2348 engine to motor conversion using ME 1004. 48v wonder if 6 m18 9.0 hd can handle an hour of mowing job.

      Reply
  • Dwight Andrews

    August 21, 2021 at 8:21 pm

    I purchased an m18 9.0 battery only to find out it wouldn’t fit my older Milwaukee tools and it would not fit in my M18 charger.I realize my Milwaukee tool kit is old but why don’t these batteries fit my older tools.Or why did you change the mounting?The older 2.0 batteries are hard to find >

    Reply
    • Samuel Pierson

      September 12, 2022 at 11:27 am

      I believe the older batteries were NiCad the newer batteries are lithium ion. Lithium ion is lighter and has more run time. The chargers are not interchangeable because if this. You can buy an adaptor to use the newer lithium ion batteries in a older tool judt do a google search.

      Reply
    • Acme Tools

      April 24, 2023 at 8:20 am

      Hello. Thank you for your question. The Milwaukee M18 Redlithium XC8.0 battery can be used in the Milwaukee M18 Jobsite fan.
      Thank you,
      Acme Tools

      Reply
  • Bob

    May 8, 2023 at 5:50 pm

    I have a Milwaukee 2853 1/4 impact driver that uses an M18 CP2.0 battery. Can I use any other battery with it as long as it’s also an M18? Thanks

    Reply
    • Acme Tools

      May 9, 2023 at 8:21 am

      Hi Bob, Thank you for your question. You can use ANY Milwaukee M18 battery in your 2853 Impact Driver.
      Thank you, Acme Tools

      Reply
      • Bob

        May 9, 2023 at 11:48 am

        Thanks for the response. I have another question about my 2853-22ct. I purchased it new from Home Depot in May of 2021 and I have never used it. It has sat in its box until I tried to use it this week. Both batteries flash red green when trying to charge and obviously will not take a charge. What is the likelihood of both batteries failing? Or is it more likely the charger is bad? Thanks

        Reply
        • Acme Tools

          May 10, 2023 at 8:11 am

          Hi Bob. When the batteries were packed into the box, they would have had a small charge. With them sitting in the box for 2 more years without being used, they could have drained to a point where the cells will not take charge, but that is a rare occurrence. However, here are the Milwaukee charger instructions to determine if the Red & Green flashing lights are indicating a faulty battery or if they were not properly set on the charger.

          A. check to determine if the battery pack was firmly seated in the charging port. Be firm when putting the battery onto the charger.
          B. remove the battery pack from Charger; RED and GREEN LEDs continue to flash simultaneously – unplug the Charger
          from the power source – required to reset the Charger PCB circuitry. LEDs should stop flashing within 7 – 10 seconds.
          C. after the RED and GREEN LEDs are no longer flashing, re-plug the Charger power cord into ‘live’ 120VAC and reinsert
          the battery pack into the Charger…
          • if the RED LED lights and stays continuously red, the battery pack is charging. The battery pack is OK – Good.
          • if the RED and GREEN LEDs again begin to flash simultaneously, the battery pack is damaged or faulty
          and will need to be replaced. Remove the battery pack from the Charger and unplug the Charger from the
          120VAC power source – required to reset Charger PCB circuitry.

          We hope this helps you. Acme Tools.

          Reply
  • martin

    June 17, 2023 at 10:43 am

    Can someone tell me if the 12 volt Vevor batteries have the same socket as the Mill m12s so the Vevor batts fit in the m12 mill tools? … and vice versa.

    Reply
    • Acme Tools

      September 6, 2023 at 2:58 pm

      Hello. Yes, you can use the M12 REDLITHIUM 3.0 Battery in place of the M12 CP1.5 battery that you currently have. The key is that you can use any Milwaukee M12 battery in the Milwaukee M12 drill.
      Thank you, Acme Tools.

      Reply
  • Imoforpc

    January 5, 2024 at 9:59 am

    Thanks for breaking down the compatibility of Milwaukee’s M12 and M18 batteries! As someone who has struggled to keep track of their battery usage and compatibility, this guide is super helpful. I appreciate the detailed explanation of the different battery types and how they interact. Will definitely be referencing this guide often!

    Reply
  • Wayne

    January 23, 2024 at 11:20 am

    I am looking to purchase the 2855-20 impact wrench. I have four M18 Red Lithium batteries rated for 1.5 AH. Any idea on how long a battery will last if i am rotating the tires on my truck?

    Reply

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