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 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

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 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

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 of purchase ranges from 2 to 3 years.

7 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
    • 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

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