Model#: MILN48-59-1200

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Milwaukee 48-59-1200 M18 REDLITHIUM High Output HD12.0 Starter Kit

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Product Overview


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
  • (1) M18 & M12 Rapid Charger 48-59-1808
  • (1) M18 REDLITHIUM HIGH OUTPUT HD12.0 Battery Pack 48-11-1812


Series: M18
Cordless: Yes
Length: 6.8 in.
Width: 6.75 in.
Height: 5.63 in.
Weight: 3.4 lbs.
Battery Amp Hours: 12 Ah
Battery Style: Slide
Battery Type: Li-Ion
Recharge Time: 2 hours
Voltage: 18V



5.0 / 5.0
2 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
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

Questions & Answers

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Browse 2 questions Browse 2 questions and 3 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