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Customer Images (10)
  • Amazing Battery
  • April 27, 2015
  • Recommended Product

The M12 Redlithium batteries are pretty amazing, and these 4.0Ah XC batteries seem to pack an extra punch in addition to their longer run time. They charge very quickly too. I had been using the standard 1.5Ah compact batteries with my M12 tool lineup, and finally got a hold of one of these 4.0Ah extra capacity batteries. The big boost in run time was the obvious bonus, but since I've heard that the XC batteries can supply certain Milwaukee tools with more power, I thought I'd run some experiments to verify the speculation. The idea makes sense in theory: more cells connected in parallel allow for more current to be discharged without the tool overheating as quickly. More current draw equals more power. The first test I ran was with my M12 5-3/8" circular saw. I took a sheet of 1/2" MDF, and purposefully wavered my cut line while I was ripping it. I stalled the tool while using the M12 compact battery, but only bogged it down while using the M12 extra capacity battery. Keep in mind that this was a very unscientific test, since I had no way of measuring the amount of torque I was applying to the handle in my attempts to get the blade to bind. The second test I ran was with my M12 1/4" FUEL impact driver. I drove a 1/4"x4" lag bolts into the end grain of a 2x4 and timed how long it took each run with the different batteries. I attempted to just let the weight of the tool drive the lag bolts, rather than pushing down on it, since I figured it would be more consistent. The XC batteries are around twice the weight of the CT ones, so that may have played into the driving speeds a minimal amount. I repeated the test four times for each battery type, and ended up with an average of 4.3 seconds for the XC battery, and 5.2 seconds for the CT battery. So both my "tests" came out in favor of the conclusion that the XC batteries supply a bit more power to the M12 tools (at least the FUEL versions). My experimental results are backed up by referencing maximum torque specifications listed on XC kits vs CT kits for the otherwise same product number tools. The extra capacity kits generally list 8-12% more torque than the compact ones. Examples include the M12 2403 drill/driver, and the M18 2604 impact hammer. Note that both of those are FUEL models, so that may play into which tools utilize the extra current output capacity.

Pros Durable, Sturdy, Good Size & Weight, Long-Lasting, Powerful

Video & Photo

  • Top 10 Contributor
  • DIY

Doresoom

Harvest, AL
25 to 34, Male
17 out of 17 people found this helpful
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By: Doresoom
  • Great addition to my M12 line. Runs my drills and jigsaw like a champ.
  • May 02, 2017
  • Verified Purchase & Recommended Product

Great addition to my M12 line. Runs my drills and jigsaw like a champ.

triggerfish

5 out of 5 people found this helpful
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By: triggerfish
  • This battery has been a time saver for my Milwaukee tools. Spending fewer trips to recharge the ...
  • March 29, 2017
  • Verified Purchase & Recommended Product

This battery has been a time saver for my Milwaukee tools. Spending fewer trips to recharge the original batteries!

Joe

4 out of 4 people found this helpful
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By: Joe
  • Lot more power but makes the tools very heavy I...
  • July 23, 2019

Lot more power but makes the tools very heavy I would stay with the 3.0 if you don’t need it but it is great for the ones that need the extra power like the hacksaw

Ben

3 out of 3 people found this helpful
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By: Ben
  • Worth every penny. Takes forever and ever and ever to...
  • June 12, 2018

Worth every penny. Takes forever and ever and ever to use it up. I use this professionally in a Hacksall for cutting wood, nails, pvc, metal tubing, threaded rod, etc. Haven’t broken out my full size Sawzall in months since I first got a M12 6.0 battery. Probably would only use the big one again if I had a lot of volume to do at once, like an extensive remodeling job where I had to cut several dozen studs out or remove a number of headers.

3 out of 3 people found this helpful
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  • batteries charge use recharge allo good
  • July 07, 2015
  • Verified Purchase & Recommended Product

Batteries charge use good run time for my M12 speaker.

Pros Easy to Use, Accurate, Good Size & Weight, Light Weight

jp

3 out of 3 people found this helpful
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By: jp
  • In response to the people that have had batteries fail
  • December 21, 2014
  • Recommended Product

Normally when the batteries fail they fail within the warranty period...take them in and get a replacement

Pros Light Weight Cons qc issue at factory
  • DIY

PaulinVT

Vermont
65 or over, Male
3 out of 3 people found this helpful
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By: PaulinVT
  • Really extend running time.
  • April 24, 2014
  • Recommended Product

I haven't timed it, but these 4.0 batteries really extend the run-time of the M12 tools. Not sure of the science behind it, but they certainly also seem to provide each of my tools with more power. Tools like the multi-tool and the right angle drill have become much more useable. There's also the added benefit of these providing a more stable base for the tool to stand upright. Highly recommended.

Pros Long-Lasting
  • Top 25 Contributor
  • Pro

Grogan14

New Hampshire
45 to 54, Male
3 out of 3 people found this helpful
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By: Grogan14
  • I bought this 2.0 battery for my M12 tools that needed a little more run time over the regular ba...
  • June 13, 2018
  • Recommended Product

I bought this 2.0 battery for my M12 tools that needed a little more run time over the regular battery, and didn't want the weight & bigger size of the 4.0. It's the same size & looks exactly like the regular battery and the only way of knowing that it's a 2.0 is the front label with the small red 2.0, or the tiny model # on the bottom. Milwaukee should make the 2.0 numbers much larger and backed by white like the M12 logo to make it easier to see in a tool bag or in limited light. The main thing is I did notice a longer run time on my hand held M12 vacuum (which is a power hog) and on my drill (I use it with a wire wheel for paint removal on wright iron railings).

Video & Photo

  • Top 250 Contributor

MikeTheReviewer

55 to 64, Male
3 out of 3 people found this helpful
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By: MikeTheReviewer
  • Great runtime out of the m12 platform, the extra runtime...
  • May 14, 2019

Great runtime out of the m12 platform, the extra runtime in the stubby 3/8 impact and the m12 rover is excellent. Battery has a little bit more bulk to it, but the runtime is well worth the tradeoff.

xRanellax

3 out of 3 people found this helpful
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By: xRanellax