Model # 48-11-2440

Internet #203806662

Store SKU #1000000720

Store SO SKU #1000065525

Milwaukee M12 12-Volt Lithium-Ion XC Extended Capacity Battery Pack 4.0Ah


M12 12-Volt Lithium-Ion XC Extended Capacity Battery Pack 4.0Ah

  • Battery operates down to 0 degrees Fahrenheit.
  • REDLINK Intelligence prevents overload and protects cells
  • Part of the M12 System, featuring over 70 tools
$7900 /each
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Frequently Bought Together

Product Overview

Compatible with all Milwaukee M12 cordless tools and instruments, the M12 REDLITHIUM XC extended-capacity battery delivers 4 Ah (48 watt-hour) of run time-even in sub-zero temperatures. Each 12 volt lithium-ion battery is laden with new-age REDLINK circuitry engineered to prevent overloads and protect against cell-damaging discharge. Revolutionary cell monitoring and temperature regulation prolong this battery's operation and life expectancy, meaning fewer work interruptions and more recharges than ever. Professionals depend on heavy-duty, long-lasting performance and Milwaukee delivers with this 12 volt battery pack.

  • Compatible with all Milwaukee M12 lithium-ion tools and chargers (sold separately)
  • Fuel gauge on tool indicates when to recharge
  • Recharges in 30-75 minutes
  • Resists drainage when not in use
  • Flat-bottom base allows tools to stand upright
  • 3-year limited warranty
  • Click here for more information on Electronic Recycling Programs

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Width (in.)


Battery Amp Hours
Battery Power Type
Lithium Ion
Color Family
Power Tool Accessory Type
Power Tool Features
No Additional Features
Tools Product Type
Power Tool
Voltage (volts)

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Customer Questions & Answers

Is the charger included in this price, or must it be purchased separately?

Is the charger included in this price, or must it be purchased separately?
Asked by: Dan
The charger is sold separately. If you don't have any of the M12 line, I'd suggest buying a combo kit with whatever tool you're interested in - that way will be much cheaper than buying the bare tool, the batteries, and charger all separately. Any Milwaukee product numbers ending in a -21 or -22 should have one or two batteries included, respectively. The ending letters "XC" or "CT" refer to extra capacity type batteries, or compact style batteries.
Answered by: Doresoom
Date published: 2017-05-15

Does the XC battery allow tools to operate at higher torque?

I asked a similar question previously and I believe my meaning was misunderstood. Obviously a 4.0 Ah battery will have twice the energy storage capacity of a 2.0 Ah battery. I'm interested in knowing if the XC batteries can discharge more electrical current at a higher rate than the compact batteries, resulting in a higher maximum power achieved for the tool using it. This should be possible because the XC batteries have more individual cells connected in parallel, and therefore can safely discharge current at a higher rate without overheating. So if I buy a Milwaukee tool like the new M12 Circular saw and only have M12 2.0 Ah compact batteries, will the torque and power output be less than if I bought an M12 4.0 Ah XC battery? If this is the case, are the electronics regulating current draw located in the tool or in the battery? Are there certain M12 tools that utilize this capability, and some that don't? Sorry for writing an essay with multiple questions, but all these factors can impact my buying decisions and how I'll use my tools, and I can't find a definitive answer anywhere.
Asked by: Doresoom
The xc batteries does enhance performance the person who said that it doesn't don't own any m12 because I have m12 sawzall, flashlight, impact, hammer drill, screw gun, edge tool, an I own 8 basic m12 batteries an 2xc m12 battery I hear an feel the difference Im bout to purchase the 4.0 for my jacket because xc only last 4/5HRS I Need 8/10HRS btw im a Milwaukee only buyer I own m18fuel GREAT TOOLS FOR ME(electrician) fav color RED so best of both worlds lol
Answered by: rick
Date published: 2016-12-15

I just bought a hackzall with a rounded base battery (2.0 ah?) and a charger. My question is, is XC 4 AH compatible with my charger & hackzall?

Asked by: Santi460
Yes, with both. This and any Milwaukee M12 battery can be used in any tool in the M12 lineup, and charged in any of the Milwaukee M12 chargers.
Answered by: Grogan14
Date published: 2017-02-17

Is the current output higher than the 2 Ah compact version?

I've heard that the XC batteries can supply more power to Milwaukee cordless tools because they have more cells that can discharge in parallel. Is this true, or is it something someone made up? It seems to be possible in theory, but I wanted to know if the Milwaukee tools are sophisticated enough to recognize the battery type and take advantage of the extra power output available.
Asked by: Doresoom
Yes, the two sets of cells in parallel allow for more current to discharge without the battery heating up as quickly. The M12 and M18 FUEL lines of tools all take advantage of this design feature for increased performance.
Answered by: Doresoom
Date published: 2017-05-15
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Customer Reviews

M12 12-Volt Lithium-Ion XC 4 Ah Extended Capacity Battery is rated 4.7 out of 5 by 44.
Rated 5 out of 5 by from Great battery pack. I work in the HVAC field and I have many M18 and M12 tools. For most tasks the M12 are my favorite due to their size and lighter weight. The 4 amp hour extra capacity M12 battery is the only way to go. Not only do you get longer run times but it seems to me that the tools have more torque and run stronger. I still have batteries from kits that I have bought 5 years ago that runs strong but the 4 amp hour extra capacity are the only ones I buy now.
Date published: 2017-02-21
Rated 4 out of 5 by from Great performance The performance of the large 4.o batteries in undeniable. Much more power and runtime than the 2.0 redlithium batteries. However, the only problem that I have found is the build qualty. I have noticed that around the glue joints at the seams of the housing are very susceptible to splitting. On mine, after a small tumble the entire black bottom shattered and I had to superglue and tape back together. A larger issue arouse when the tip of the battery neck split which I also had to fix. This is a problem because now the neck of battery is at an angle, which makes it very difficult to place the battery in the charger.
Date published: 2014-03-29
Rated 5 out of 5 by from Impressive run time Can't get over how long this battery lasts. On top of that, its shape allows the tool to stand up, which is very convenient for assembly work. Overall highly recommended for breathing new life into your m12 tools. I also use it in conjunction with the USB charging adapter for camping or road trips. It's practically always with me.
Date published: 2017-07-14
Rated 5 out of 5 by from This battery upgrade made my 3/8 ratchet useful. Before this... This battery upgrade made my 3/8 ratchet useful. Before this I liked the tool but the super small M12 batteries made it not last long enough to bother. With this battery now I use the tool quite a bit more often.
Date published: 2017-04-18
Rated 5 out of 5 by from Great buy Worth the 40 dollars it's a grea step up from the batteries they come with. Well worth the money stronger, longer and more power
Date published: 2017-07-18
Rated 5 out of 5 by from Great running time. The light runs twice as much. It serve as a base for the drill.
Date published: 2017-05-16
Date published: 2017-04-28
Rated 5 out of 5 by from 5 Star Review Rating provided by a verified purchaser
Date published: 2017-04-04
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