Rated 4.6 out of 5 by 20
Rated 4.0 out of 5.0 by Pedro Good battery
Good quality battery.milwaukee is a good brand.i reccomend it.
May 31, 2016
Rated 5.0 out of 5.0 by Doresoom Amazing Battery
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.
April 27, 2015
Rated 5.0 out of 5.0 by Jethro Great !
It gives the M12 impact driver more power and the run time is outstanding . Milwaukee is the way to go. I had Craftsman cordless tools for 20 years , until 2 years ago and gave all of them to my son and have been with Milwaukee .
March 10, 2016
Rated 4.0 out of 5.0 by HDShopper Great Battery
Awesome power and this battery lasts! Milwaukee has awesome products!
February 10, 2016
Rated 4.0 out of 5.0 by Batterybuyer I got a battery
I charged it and it works, what else, oh yeah I hate, hate, hate, those plastic packages.
January 19, 2016
Rated 5.0 out of 5.0 by SGMillerDesigns Makes the M12 Even Better!
I am extremely impressed with the Milwaukee M12 lineup, and I think that the battery holds a lot of weight to why. The battery life that the tools have is amazing, and the extended battery makes it that much better.
The battery only takes a little bit longer to charge than the standard M12 battery, which takes 30 minutes. The extended battery does not take hours to charge. Batteries are expensive, but $80.00 for a single battery is a bit much. Look for multi-packs and promotional SKUs before resorting to this single battery SKU.
It should be noted that the shape of the battery can ruin the ergonomics of some tools. The M12 tools are designed to make the battery look very sleek and almost built in to the tool, so the extended battery can look a little weird in some (palm nailer, jobsite radio). This is just cosmetics though, the longer battery life is worth it!
August 11, 2015
Rated 5.0 out of 5.0 by Bear324 Milwaukee M12 EXTENDED Life
Yes and yes... those are the answers to your 2 questions...
Q1 Does this battery really provide the longer life it's rated to do?
Q2 Is this battery worth the cost?
Yes and Yes... as for cost, if this was $150.00, it would be worth the investment! It Truly extends the use time , in my case by a factor if 5.2 times the original (small) battery.
January 13, 2015
Rated 4.0 out of 5.0 by Dave 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.
March 29, 2014