Model#: MILN48-11-1840

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Brand new items;Full manufacturer warranty available
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New or Recon items with possible minor cosmetic damage; CPO 120 day money back guarantee
Returned items inspected, repaired and tested by CPO technicians; CPO 60 day money back guarantee

Milwaukee 48-11-1840 M18 XC 18V 4 Ah REDLITHIUM 4.0 Lithium-Ion Battery

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Product Overview


Milwaukee's RedLithium batteries already provide some of the best performance and longest run times in the industry, and with the improved RedLithium extended amp hour battery, the best just got better. With two times the run time, two times the recharges, 20% more power and full compability with all Milwaukee cordless Lithium-Ion tools, why choose anything else?
  • Two times more run time and recharges for a longer lasting battery.
  • Provides up to 20% more power to your tools for increased performance
  • Operates below 0 degrees F for cooler overload-free operation
  • Full system compability with all Milwaukee cordless Lithium-Ion tools
  • M18 XC 18V 4 Ah RedLithium 4.0 Lithium-Ion Battery - 48-11-1840


Series: M18
Battery Amp Hours: 4.0 Ah
Battery Style: Slide
Battery Type: Li-Ion
Compatible Models: Milwaukee M18 Cordless Tools
Voltage: 18V



4.8 / 5.0
22 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Stars
Yes, I would recommend this to a friend (17)
Powerful (8)
Unbelievable runtime
It runs and runs and runs it"s like a dream.
I think it"s the best battery on the market.
October 3, 2013
Originally posted at
Works good
It works very well but the extra weight is not much but the smaller 2.0 I find much easier when using tool for long periods of time.
February 16, 2013
Originally posted at
Used for industrial work
December 26, 2012
Originally posted at
Yes, I would recommend this to a friend
Charge remaing indicator is a huge plus
I carry a grinder and an impact wrench in the tractor when haying for changing and touching up knives on a disc mower. It is very handy to know how much charge is left in the battery, so I'm not left without power, and not unneccesarily changing batteries to avoid being without use of my tools. The 4ah battery provides great run time, especially on the grinder, which are notorious power hogs. I would recommend this battery and the Fuel tools to anyone who needs a reliable, hard use cordless tool.
July 17, 2014
Yes, I would recommend this to a friend
Tried the rest
Alternating two batteries, I can work all day.
June 22, 2013
Yes, I would recommend this to a friend
I have always ran Milwaukee tools, and as long as CPO is around I will continue to do so. Great tools, great prices, & great customer service. Thank you guy
June 30, 2013
Yes, I would recommend this to a friend
Good power
I'm not sure that this battery lasts any longer than any other but it does provide my sawzall with enough power to cut through everything I've put in front of it. The battery does seem to charge relatively quickly.
May 17, 2014
Yes, I would recommend this to a friend
Satisified with this product
I like the fact it hold charge longer. Haven't had it long but have only charged it once so far and it rides around in my truck and doesn't get used every day but have had for 3 weeks and so far one charge, far better than the Red
December 5, 2013
Yes, I would recommend this to a friend
Lots Of Power
Great power. Works for a long time. Keeps the grinder going a lot longer.
June 24, 2014
Yes, I would recommend this to a friend
Great Bonus
I could hardly believe this bonus battery is just like what came with the kit!
July 29, 2014

Questions & Answers

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Browse 10 questions Browse 10 questions and 12 answers
does this battery come with a charger? will it fit the m18 flood light?
Vinnie on Dec 18, 2015
BEST ANSWER: No, the 48-11-1840 does not include a charger. The M18 battery will fit any M18 branded Milwaukee tool
Do you know how this 4 Ah compares with the upcoming 5 Ah as far as weight?
Cheech Wizard on Oct 9, 2014
BEST ANSWER: The weight is relatively the same however the 5 amp hour battery will produce approximately 30 percent more run time then the 4 amp hour battery.
I have a drill that uses v18 batteries will the m18 batteries work?
Jamie on Aug 1, 2015
BEST ANSWER: The Milwaukee M18 series and the V18 series batteries are not cross-compatible.
what is the battery warranty?
will the 48-11-1840 interchange with the 48-11-1830 battery?
Pat on Nov 1, 2013
BEST ANSWER: No the batteries are not interchangeable. The 48-11-1830 is a V18 battery and the 48-11-1840 is a M18 battery.
will 48-59-1801 charger, charge Milwaukee 48-11-1840 M18 XC 18V 4 Ah batteries
Michael on Oct 12, 2013
BEST ANSWER: Yes, the 48-11-1840 battery can be charged with this charger. - 90 minute charge time
Is there a replacement lithium battery for 48-11-2230 and 48-11-1024 batteries. The -1024 will not charge and the 2230 runs down fast. HELP!!!
Gene on Jun 13, 2013
BEST ANSWER: Currently, there isn't a replacement for these two batteries.
I have the 18 volt nicad tools ,what are the compatible batteries available now
Pwc on Jun 5, 2013
BEST ANSWER: It is not recommended that these two battery types be interchanged.
Will this work in all 18 volt Milwaukee tools? I have NiCad & V18 batteries now, what if any difference between M18 & V18?
Bob on Feb 18, 2013
BEST ANSWER: No, this battery is not interchangeable with the NiCad battery.

The V18 system as an upgrade to its existing cordless power tools, promising a 50 percent longer run time than nickel-cadmium batteries.

The M18 series tools were no longer backwards compatible with the older nickel-cadmium systems, allowing the tools themselves to be redesigned and balanced with strictly lithium-ion power packs. Notably, the M18 series came with a frameless motor that could produce the same amount of power as a larger, traditional electric motor.
does this replace 48-11-1828 batteries?
sparky on Jan 8, 2013
BEST ANSWER: Yes, this is the next generation Milwaukee battery. This battery has a amp hour rating of 4 amp hours.