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Milwaukee M12 Batteries

The Milwaukee M12 battery series is known for its high-quality, reliable, and versatile power solutions for cordless tools. These batteries deliver optimal performance and durability, making them a favorite among professionals and DIY enthusiasts alike. This year, 2023, has seen the introduction of several new models in the series. In this review, we'll take a closer look at these batteries, their key features, and what sets each apart.

Types of M12 Batteries

There are several types of M12 batteries, each designed for different needs and applications. Here are the main types:

  • M12 REDLITHIUM Compact Batteries: These are the standard batteries in the M12 lineup. They offer a great balance of power, runtime, and weight. They're perfect for most M12 tools and are available in 1.5Ah, 2.0Ah, and 3.0Ah versions.
  • M12 REDLITHIUM XC Batteries: The XC (extended capacity) batteries offer longer runtime than the compact batteries. They're heavier but provide more power, making them ideal for power-hungry tools. They're available in 4.0Ah, 5.0Ah, and 6.0Ah versions.
  • M12 REDLITHIUM CP Batteries: The CP (compact power) batteries are the lightest in the M12 lineup, making them perfect for compact tools and overhead applications. They're available in 1.5Ah and 2.0Ah versions.
  • M12 REDLITHIUM HIGH OUTPUT Batteries: These batteries provide the most power and runtime in the M12 lineup. They're designed for high-demand applications and are available in 3.0Ah, 6.0Ah, and 8.0Ah versions.

Key Considerations

When buying an M12 battery, consider the following:

  • Power Needs: The power needs of your tools should guide your choice of battery. More powerful tools require a battery with a higher amp-hour (Ah) rating. A higher Ah rating means more power and longer runtime, but also a heavier battery.
  • Weight and Size: If you're using a tool for a long time or in awkward positions, a lighter, compact battery might be more suitable. However, keep in mind that smaller batteries usually mean less power.
  • Battery Life: All batteries degrade over time, but how quickly they degrade depends on the quality and technology used. Milwaukee's REDLITHIUM technology provides superior pack construction, electronics, and performance to deliver more work per charge and more work over the life of the pack.
  • Budget: Higher capacity batteries are usually more expensive. Determine your power needs and find a balance between power, weight, and cost.

Charging Options

Milwaukee offers several charging options for the M12 batteries, including:

  • M12 Standard Charger: This is the basic charger for M12 batteries. It charges one battery at a time and doesn't have any special features.
  • M12/M18 Multi-Voltage Charger: This charger can charge both M12 and M18 batteries. It still charges one battery at a time but is convenient if you have both M12 and M18 tools.
  • M12 Six Pack Sequential Charger: This charger can charge up to six M12 batteries sequentially, meaning it starts charging the next battery when the previous one is fully charged. It's perfect for heavy users with multiple batteries.


Choosing the right Milwaukee M12 battery requires understanding your power needs, considering the weight and size of the battery, and considering your budget. Remember that higher amp-hour ratings offer more power but are heavier and costlier. Also, consider your charging needs and whether a standard or multi-voltage charger would be more convenient.

The Milwaukee M12 battery lineup offers a wide range of options, from compact batteries for lightweight tools to high-output batteries for heavy-duty applications. By considering your needs and the factors in this guide, you can find the perfect M12 battery for your tools and tasks.

Top 5 Milwaukee M12 Batteries of 2023:

1. Milwaukee M12 RedLithium XC 4.0

Milwaukee M12 RedLithium XC 4.0

The M12 REDLITHIUM XC 4.0 Battery Pack delivers superior runtime, power, and recharges than its predecessors. With Milwaukee durability built into each pack, the REDLITHIUM XC 4.0 battery operates cooler and performs in climates below 0°F/-18°C. It's built to withstand job site conditions and deliver dependable performance day after day.

The M12 REDLITHIUM XC 4.0 Battery Pack also provides up to twice the run time, 20% more power, and twice the recharges compared to standard lithium-ion batteries. Its durable construction, combined with Milwaukee's unique REDLINK Intelligence, offers superior overload protection, preventing you from damaging your cordless power tools in heavy-duty situations.

2. Milwaukee M12 RedLithium CP 2.0

Milwaukee M12 RedLithium CP 2.0

The M12 RedLithium CP 2.0 battery pack provides superior pack construction, electronics, performance, and even impact resistance to reach your full potential. It offers 2.0 amp-hours of runtime, and with the onboard fuel gauge, you can check the remaining charge at any time.

This battery has REDLINK Intelligence that provides optimized performance and overload protection using total system communication between tool, battery, and charger, all of which ensures the best possible performance for your tools. It's a compact and lightweight solution for users looking for lower weight without sacrificing power or runtime.

3. Milwaukee M12 RedLithium High Output CP 3.0

Milwaukee M12 RedLithium High Output CP 3.0

The M12 REDLITHIUM High Output CP 3.0 Battery Pack provides 50% more power, runs 50% cooler, and delivers 120% more runtime than a standard compact M12 battery. This significant upgrade in power and capacity makes it an ideal choice for high-demand tools and applications.

The unique combination of performance, durability, and ergonomic design makes the M12 RedLithium High Output CP 3.0 a standout choice for both professionals and hobbyists. This battery can deliver fade-free power and runs substantially cooler through heavy applications, allowing tradesmen to push their cordless tools harder and longer than ever before.

4. Milwaukee M12 RedLithium XC 6.0

Milwaukee M12 RedLithium XC 6.0

The M12 REDLITHIUM XC 6.0 Battery Pack delivers up to 3X more runtime, 20% more power, and 2X more recharges than standard lithium-ion batteries. The lithium-ion battery pack features superior pack construction, electronics, and performance giving you more work per charge and more work over pack life than any battery on the market.

This battery pack offers high performance, long life, and exceptional durability. It's well-suited to heavy-duty applications and can handle the rigors of the job site with ease. With the onboard fuel gauge, you can check your charge at any time, ensuring you never have to guess how much power remains.

5. Milwaukee M12 RedLithium High Output HD12.0

Milwaukee M12 RedLithium High Output HD12.0

The M12 RedLithium High Output HD12.0 is designed for those who need extreme runtime, performance and durability on the jobsite. This battery delivers up to 4X more runtime, 20% more power, and 2X more recharges than standard lithium-ion batteries.

The High Output HD12.0 battery is engineered for Milwaukee M12 tools with high power delivery, and it provides the next large step towards full corded replacement when paired with the M12 cordless tools. It has a massive onboard fuel gauge that tells you exactly how much charge you have left in the battery, giving you the confidence to know you’ve got the power to finish.


The Milwaukee M12 battery series offers a diverse range of power solutions to cater to your specific needs. Whether you need a compact battery for light tasks or a high-capacity battery for heavy-duty applications, Milwaukee has got you covered.

Their batteries are renowned for their durable construction, long lifespan, and impressive performance. With these batteries, you can work longer and charge less, making your cordless tools more efficient and reliable than ever.

Remember, the best battery for you depends on your specific needs, so consider the power, runtime, and the tools you'll be using before making a decision.