Free Shipping and No Hassle Returns
Free Shipping
We offer free shipping on orders over $199.*
No Hassle Returns
Don’t like it? Send it back. It’s that simple.*
Same Day Shipping
Most orders ship same day if placed by 5PM EST (M-F)
*Restrictions Apply. See Details »
Model#: MILN48-11-1840

What are the different product conditions?

Brand new items;Full manufacturer warranty available
Manufacturer inspected, repaired and tested items; CPO 120 day money back guarantee
Open Box
New 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 REDLITHIUM XC4.0 Battery Pack

(See Price in Cart)
Free Shipping
(continental U.S.)
In Stock
Ships Today
  • Due to federal regulations, this product can only be shipped within the continental US. Express delivery not available.

Frequently Bought Together

Product Overview


Delivers up to 2X more runtime, 20% more power and 2X more recharges than standard Li-Ion batteries. The M18 REDLITHIUM XC4.0 Battery Pack features superior pack construction, electronics and performance to deliver more work per charge and more work over pack life than any battery on the market. It offers 4.0 Ah of runtime. With Milwaukee durability built into each pack, this battery runs cooler and performs in climates below 0-degrees F/-18-degrees C. Managed by Milwaukee’s exclusive REDLINK Intelligence, the battery features overload protection to prevent you from damaging your cordless power tools in heavy-duty situations, while the discharge protection prevents cell damage. The temperature management system and individual cell monitoring help maximize battery life. Switch to the M18 REDLITHIUM XC4.0 Battery Pack to instantly upgrade the runtime and durability of your Milwaukee M18 cordless tools.
  • REDLINK Intelligence: Provides optimized performance and overload protection using total system communication between tool, battery and charger
  • Best-in-class construction: Offers long-lasting performance and durability
  • Fuel gauge onboard: Displays remaining runtime for less downtime on the job
  • All-weather performance: Delivers fade-free power in extreme jobsite conditions
  • Versatility: Powers more than 40 Milwaukee M18 cordless power tools
  • M18 REDLITHIUM XC4.0 Battery Pack - 48-11-1840


Series: M18
Length: 6.80 in.
Width: 4.5 in.
Height: 6.12 in.
Weight: 1.72 lbs.
Battery Amp Hour: 4 Ah
Battery Style: Slide
Battery System: M18
Battery Type: Li-Ion
Compatible Models: All M18 Tools
Recharge Time: 1 Hour
Voltage: 18V



4.8 / 5.0
21 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Yes, I would recommend this to a friend (17)
Powerful (8)
Yes, I would recommend this to a friend
Can never have enough bateries
Always nice to have reliable spare batteries
August 2, 2016
Yes, I would recommend this to a friend
Fast shipping
Fast shipping
July 31, 2016
Yes, I would recommend this to a friend
Long life
Nice run time with this battery. Cant wait to try a 5.0 M18 battery
May 20, 2016
Yes, I would recommend this to a friend
Lasts a long time
May 2, 2016
Yes, I would recommend this to a friend
This battery has some juice in it! It definetly lasts longer
I use this battery for wprk and its great for my milwaukee combo!
April 26, 2016
Yes, I would recommend this to a friend
Recd with drill driver combo fantastic work time, compared to normal batteries
November 12, 2015
Long lasting in the beginning but less endurance over time.
I purchased this with an impact driver to drive in 10 inch long timber screws into two 8 inch posts. Initially the battery lasted for a long time, screwed in at least 30 screws before needing to swap out a battery. After the third charge the batteries only lasted for 10 screws. Not good, lost nearly 70% of the initial life in a short period of time. This all occurred within 2 weeks.
October 19, 2015
great batteries
Love these batteries, I wish they were more affordable.
October 13, 2015
Yes, I would recommend this to a friend
Compact Power Plant
It's amazing that one battery can have this much power. Enough power to run all day in my mechanic shop. I also like the remaining power indicator on Milwaukee red lithium ion batteries.
October 10, 2015
Yes, I would recommend this to a friend
3rd battery means never running out of power
Always have a battery on the charger,ready to go
October 8, 2015

Questions & Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
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.