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Internet # 337126822

Model # 48-59-1813GB-48-11-1881

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M18 18V Lith-Ion REDLITHIUM FORGE XC 8.0 Ah Battery w/ FORGE 12. 0Ah Battery & Charger

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$501.00
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  • HIGH OUTPUT 12.0 power in a smaller size and lighter weight
  • COOL-CYCLE Capability for high-speed cooling and less downtime
  • 35min Supercharge to 80% with M18 Dual Bay Super Charger
  • View More Details

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Product Details

About This Product

Our M18 REDLITHIUM FORGE HD12.0 Battery Pack delivers 50% more power vs the HIGH OUTPUT 12.0, and the longest life vs REDLITHIUM batteries. REDLITHIUM FORGE are Milwaukee's most powerful, fastest charging, and longest life batteries. The M18 REDLITHIUM FORGE HD12.0 delivers 12 amp. hours of runtime with 50% more power vs the HIGH OUTPUT 12.0, providing optimal power and runtime for demanding applications. This lithium-ion battery has the longest life, the most recharges, and the best performance over the life of the battery. It is also designed with resistant housing for increased protection against exposure to common oils, greases, and solvents. Built-in REDLINK Intelligence protects the battery from overloads, preventing you from damaging your cordless power tools in heavy-duty situations. The REDLITHIUM FORGE HD12.0 battery is fully compatible with 275+ M18 solutions. Our M18 & M12 Rapid Charger charges battery packs up to 40% faster, reducing your downtime and maximizing your productivity. The battery charger accepts all MILWAUKEE M18 and M12 batteries, providing a charging upgrade for both systems. The battery charger communicates directly with your battery pack to monitor cell voltage, temperature and charge status to ensure a full charge.

Highlights

  • 50% More Power vs HIGH OUTPUT HD12.0
  • Longest life for the most recharges and best performance over the life of the pack
  • REDLITHIUM FORGE provides the most powerful, fastest charging, and longest life batteries within REDLITHIUM
  • Fully compatible with the M18 system, featuring 275+ tools
  • Best protection form jobsite, weather and environmental conditions
  • PWR Level 5 on the REDLITHIUM Power scale
  • Resistant housing designed to provide increased protection against exposure to common oils, greases, and solvents
  • Click here for more information on Electronic Recycling Programs
  • Return Policy

Product Information

Internet # 337126822

Model # 48-59-1813GB-48-11-1881

Additional Resources

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From the Manufacturer

Specifications

Details

AC\DC

AC

Battery Amp Hours

12 Ah

Battery Power Type

Lithium Ion

Battery Voltage (V)

18V

Charge time (min.)

130

Charger Included

Charger Included

Color Family

Red

Cordless Tool Type

Battery/Charger Set

Individual Battery Weight

3.3 lb

Number of Charging Ports

2 Port

Number of Total Batteries Included

2

Power Tool Accessory Type

Battery and Charger Set

Power Tool Features

No Additional Features

Rechargeable

Yes

Returnable

90-Day

Used with Equipment Type

Specialty Power Tool

Questions & Answers

Does this come with a free tool
ByJan 22, 2026
0 Answer | 
Answer This Question

Is this deal online only
ByJan 9, 2026
0 Answer | 
Answer This Question

I understand that Milwaukee batteries are warranted for three years. But I have read that this period begins on the day it was manufactured. Is this correct?
ByJan 8, 2026
1 Answer | 
Answer This Question

That is correct!

By|Jan 9, 2026


    I’ve heard about the Forge batteries and burning out older M18 tools. Is Milwaukee looking into this and is a compatibility issue with older tools?
    ByDec 29, 2025
    1 Answer | 
    Answer This Question

    Milwaukee has confirmed that M18™ REDLITHIUM™ FORGE™ batteries are fully compatible with all M18™ tools. The M18 system was designed from the start to be backward and forward compatible, so you can use FORGE packs in older tools without damaging them.

    By|Sep 9, 2026


      what is warranty on 12ah forge battery
      ByDec 7, 2025
      1 Answer | 
      Answer This Question

      The Milwaukee M18™ REDLITHIUM™ FORGE™ HD12.0 Battery Pack (48-11-1813) comes with a 3-Year Limited Warranty.

      By|Sep 9, 2026

        (2)

        How many charge ports on this charger?
        ByNov 8, 2025
        1 Answer | 
        Answer This Question

        Hi, Susan. There is an M12 port and an M18 port on this charger.

        By|Nov 11, 2025


          Viewing 1-6 of 6

          Customer Reviews

          4.8 out of 5

          • 4.8 out of 560 reviews
          • 100% recommend this product
          Filter by:
          Showing 1-10 of 560 reviews
          Got this kit on a great deal. The Milwaukee M18 12Ah Forge battery delivers impressive runtime and consistent power, even under heavy loads. It charges quickly, runs cooler than older packs, and feels durable on the job. Great upgrade for anyone using high-demand M18 tools regularly.
          by
          I’ve purchased several M18 12Ah batteries and have consistently had a positive experience with their performance and reliability. As someone who prefers Milwaukee tools, I appreciate the overall quality and durability the brand delivers. That said, I do feel the pricing is somewhat high, and more frequent promotions or sales would make these products even more appealing to loyal customers.
          by
          Huge step up from their standard batteries. I run this on their M18 table saw and the basic 5ah batteries would bog down when cutting anything that wasn’t perfectly dry. With this I never feel like the motor is stalling out and I don’t have any issue cutting even PT wood. If you’re looking to upgrade your batteries this is a worthy investment.
          by
          Really good product best performance.
          by
          I am using this battery with the m18 vacuum. So far I have been able to complete all my tasks before running out of battery. It is very nice not to have to worry about the cord.
          by
          Can’t beat the power of the 12 and the forge battery line is now my go to.
          by
          comes in 2 separate boxes but doesnt much matter, comes complete with 2 batteries and a rapid charger, price is hard to beat but imho Milwaukee batteries are always extremely overpriced. serves its purpose and so far so good.
          by
          The forge batteries are a huge improvement over the previous generation, which often failed or refused to charge. These charge quickly on the new supercharger, and I am primarily using the 12Ah for the milwaukee dual battery chainsaw. The chainsaw uses a lot of battery but I am quite surprised how long the 12Ah's last. I can make like 40 cuts of a 16 inch tree before killing the battery on a mild day. The only issue I have is when it is cold out (< 30F), then the batteries seems to only last about 2/3 of their normal usage.
          by
          This was an amazing deal. I frequently see one of these batteries cost as much as I paid for two and it came with a rapid charger. I couldn’t be happier with these heavy duty batteries!
          by
          This customer chose to rate the product and not provide text.
          by
          Showing 1-10 of 560 reviews

          Compare Key Features

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          Product Snapshot

          Built for long-lasting durability and high performance in demanding applications, with rapid charging.
          Ideal for customers who want powerful, fast-charging batteries, ensuring optimal performance and durability.
          Ideal for professionals or homeowners seeking long-lasting power and performance, this battery delivers 50% more power than the HIGH OUTPUT 12.0 and features a high-speed cooling system for reduced downtime.
          Built for long-lasting durability and high performance, delivering 50% more power and rapid charging.

          Voltage

          18V
          18V
          18V
          18V

          Capacity

          12 Ah
          12 Ah
          12 Ah
          12.0 Ah

          Battery Type

          Lithium Ion
          Lithium-Ion
          Lithium Ion
          Lithium-Ion

          Charging Time

          130 minutes
          130 minutes
          35 min
          35 min to 80%

          Run Time

          12 amp hours
          12 amp hours
          12 amp hours