When it comes to cordless tools , Milwaukee is a name trusted by both professionals and DIY enthusiasts. However, with the M18 lineup featuring a range of batteries—CP, XC, HO, and now FORGE—it can be challenging to determine which one suits your project. Choosing the correct battery doesn’t just affect how long your tool runs—it can impact power output, weight, and overall tool performance.

Let’s examine this Milwaukee battery comparison and break down what each battery offers so you can confidently match the right pack to the job.

Best for: Light-duty tools, precision work, tight spaces.

Milwaukee CP (Compact) batteries are small, lightweight, and designed for tools where maneuverability matters. Typically ranging from 1.5Ah to 3.0Ah, these batteries are ideal for handheld tools such as drills, impact drivers, or work lights. They charge quickly and won’t weigh down your tool, making them perfect for overhead or extended-use jobs.

Pros:

Keep in Mind: Lower amp-hour ratings mean shorter runtime, so these aren’t ideal for power-hungry tools like saws .

Best for: General use, medium-duty applications

Milwaukee XC batteries are the all-around choice for most users. Offering capacities ranging from approximately 4.0Ah to 6.0Ah, these packs strike a good balance between power, runtime, and weight. XC batteries are great for impact wrenches , hammer drills, and saws used intermittently throughout the day.

Pros:

Keep in Mind: Heavier than CP batteries, but still manageable for most tasks.

Best for: Maximum performance in cold weather and high-amp tools

Milwaukee High Output (HO) batteries combine improved cell technology and advanced cooling designs to deliver longer runtimes and run cooler under stress. Available in sizes such as 6.0Ah and 12.0Ah, these batteries perform exceptionally well in tools like SDS Max rotary hammers or outdoor power equipment .

Pros:

Keep in Mind: Pricier than standard packs—but worth it for pros who need consistent performance.

Best for: Users who demand the most advanced battery tech Milwaukee offers

The Milwaukee FORGE battery is the latest evolution in their M18 system , offering unprecedented performance with REDLITHIUM Forge cell technology. It charges faster, delivers unmatched thermal performance, and handles the most punishing conditions.

Pros:

Keep in Mind: Premium features come with a premium price tag—best for professionals who rely on top-tier equipment.

Choosing the correct battery depends on what you need most—whether it’s lightweight flexibility, long runtime, or brute force power. Here’s a quick Milwaukee battery comparison: