Milwaukee 48-59-1200 M18 REDLITHIUM High Output HD12.0 Ah Lithium-Ion Battery and Charger Kit

Model: miln48-59-1200
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Milwaukee 48-59-1200 M18 REDLITHIUM High Output HD12.0 Ah Lithium-Ion Battery and Charger Kit Model: miln48-59-1200

Product Features & specs :

Milwaukee 48-59-1200 M18 REDLITHIUM High Output HD12.0 Ah Lithium-Ion Battery and Charger Kit

The M18 REDLITHIUM High Output HD12.0 Battery Pack provides 50% more power and runs 50% cooler vs M18 REDLITHIUM HD battery packs. The massive increase in power elevates the performance of the entire M18 system and drives the next breakthrough in M18 FUEL, generating the power of 15A corded product. It delivers fade free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before.The M18 REDLITHIUM HIGH OUTPUT HD12.0 is the best performing cold weather pack ever made, providing increased power in extreme cold weather conditions (below 0F / -18C). It provides the most work per charge of any professional power tool battery in the industry, driving full corded replacement on the jobsite. The REDLITHIUM HIGH OUTPUT HD12.0 battery is fully compatible with 150+ M18 solutions.
  • 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 the best protection against jobsite conditions
  • M18 & M12 Rapid Charger charges packs up to 40% faster
  • Versatility: Powers more than 150 M18 cordless solutions
  • Fuel gauge onboard: Displays remaining run-time
What’s Included:
  • (1) M18 REDLITHIUM HIGH OUTPUT HD 12 Ah Lithium-Ion Battery - 48-11-1812
  • (1) M18 & M12 Rapid Charger - 48-59-1808
Battery Type
Compatible Models
Milwaukee M18 Products
Recharge Time
2 hours
Battery Amp Hour
12 Ah
Battery Style
Battery System
6.8 in.
6.75 in.
5.63 in.
3.4 lbs.
Warranty Term
3 Year

Reviews :

5.0 / 5.0
4 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Would you recommend this product?
Yes (2)
Powerful (2)
Battery Longevity (if applicable) (2)
Easy To Use (1)
Value (1)
Best Uses
Heavy Duty Requirements (2)
Frequent Use (1)
Large Projects (1)
Small Projects (1)
Would you recommend this product?
Easy To Use
Battery Longevity (if applicable)
Best Uses
Frequent Use
Heavy Duty Requirements
Large Projects
Small Projects
Home Repair
Excellent long life
I purchased this as an adjunct battery to use with a new grinder because it was a great deal. What a great decision!

The battery fits all of our other M18 tools, with the exception of the shop vacuum - it is a really tight fit for that and our fingers are too fat to get the battery in & out easily.

It is difficult to believe: the 7 1/4" circular saw lasted all day on one charge. I was cutting a lot of 3/4" plywood - a few sheets at a time - and it still took all day to get the work done. I literally forgot that I was using a battery-based tool. There was still a tiny bit left on the battery.

I use the grinder for my welding, which means that I am using it hard for maybe a few minutes for touch up, to up 30 minutes to clean up a piece for finishing. I forgot to charge the battery at the end of the day, and it lasted the next day.

It is a valuable addition to our tool collection.

A strong recommendation from a someone who is typically too cheap to spend this much on a battery!!!
July 17, 2020
3 months ago
Describe Yourself:
Avid Do-it-Yourselfer
Would you recommend this product?
Battery Longevity (if applicable)
Best Uses
Heavy Duty Requirements
Extra power
brand new, definitely adds some extra UGGA DUGGAS to your impact. long lasting, very happy.
June 9, 2020
4 months ago
Describe Yourself:
Is a much better choice for the demanding prices!
A must for the blower and the saws! I have many of the 18 Volt fuel pieces and love every one of them. I am a tile contractor and have not had a single problem with any one of them!
January 31, 2019
Originally posted at
Great for lights, especially the rocket lights
Even though Milwaukee came out with some new high powered toys, due to the additional weight. I find the 12.0ah batteries better suited for stationary items, like the miter saws, table saws, and lighting products. Products that you won't notice the weight since you will not have it in your hand for an extended period of time.

The 12ah battery was excellent with my dual power light, the 2131-20. On high I got a runtime of almost 10hrs. More than enough for a full day's job on a jobsite with no power and you have to work in dark areas.

There are some products, like the two original rocket lights that won't fit the 12ah batteries, I believe Milwaukee will service those for free, I sent it in via the EService and I am awaiting the modification

The rapid charger was able to charge the 12ah battery in about 100 minutes. In comparison , the regular m12/m18 charger took about 210minutes to charge the battery.
The 12.0 batteryHow you use this product. Things that are great about it. Things that aren't great about it.
August 20, 2018
Originally posted at

Q & A :

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Browse 2 questions Browse 2 questions and 4 answers
Are they the old style batteries?
A shopper on Apr 11, 2019
BEST ANSWER: The lithium batteries used on the HD12 are the lates style and have incredible life.
Does it require a different charger than the m18 fuel 6.0 battery?
Kevin M on Jun 18, 2018