Milwaukee M18 Battery Comparison: Ultimate Buying Guide

Simplifying Battery Power: Volts vs. Amp-Hours and What They Mean for Your Tools

Understanding volts and amp-hours is essential because these two metrics provide distinct insights into the performance and runtime of your power tools.

• Volts: Think of volts as the measurement of tool power. It quantifies the power a battery can deliver at a given time. The higher the voltage rating, the more powerful your tool will be. So, if you’re tackling demanding tasks that require substantial power, opting for a higher-voltage tool is a wise choice.
• Amp Hours (Ah): Conversely, Amp-hours represent the battery’s runtime. This metric can be likened to the ‘fuel tank’ of the battery. A higher amp-hour rating means a larger ‘fuel tank,’ allowing you to run your cordless power tool on a single charge for a more extended period. If you have projects that demand longer operating times between charges, selecting a battery with a higher amp-hour rating is the way to go.

It’s important to note that several factors within your power tool also influence how efficiently it transfers power from the battery and how long it can operate on one charge. These factors must be considered to ensure that your chosen battery aligns with the specific requirements of your project.

The Milwaukee M18 Battery Trio: CP, XC, and HD

Compact Power (CP) Batteries

The CP batteries are for individuals seeking lightweight and efficient power solutions. Packed with 5 Li-ion cells compatible with M12 and M18 tools, these compact batteries are designed to shine in tasks with moderate power demands and repetitive operations. As a result, they prove to be the perfect match for tools such as Screw Guns, Cable Cutters, and Drain Snakes.

Extended Capacity (XC) Batteries

Milwaukee XC batteries are your go-to solution for extended runtime and enhanced performance. With 10 Li-ion cells, these batteries provide extended run-time due to their larger size, making them ideal for powering demanding applications. 

High Demand (HD) Batteries

HD batteries are exclusive to the M18 tool lineup and are built for high-demand situations. These batteries housing 15 Li-ion cells provide top-tier performance in high-draw equipment and tasks that require extended runtime, such as working with Rotary Hammers, Right Angle Drills, or String Trimmers. Unlike the CP and XC batteries, the HD series has upgraded battery technology to boost power and runtime significantly.

Key Features of Milwaukee Batteries

• Superior Pack Construction: With top-tier pack construction, electronics, and overall performance, this battery delivers exceptional work per charge and extends its work-life far beyond what you’d find elsewhere.
• Durable Design: Built for heavy-duty use, it remains resilient even in demanding conditions and operates reliably in temperatures as low as 0°F/-18°C.
• Compact and Lightweight: Its compact design allows you to maneuver easily in tight workspaces while minimizing fatigue during extended projects.
• REDLINK Intelligence: The integrated REDLINK Intelligence provides overload protection, ensuring your cordless power tools are safe during heavy-duty use.
• Discharge Protection: Prevents cell damage, enhancing the battery’s lifespan.
• Temperature Management: An integrated temperature management system and individual cell monitoring contribute to maximizing the battery’s life. 

Milwaukee M18 Battery Comparison Chart

Key Attributes	2.0 Ah	3.0 Ah	4.0 Ah	5.0 Ah	5.0 XC	6.0 Ah	8.0 Ah	12.0 Ah
REDLINK Technology	✓	✓	✓	✓	✓	✓	✓	✓
Discharge Protection	✓	✓	✓	✓	✓	✓	✓	✓
Fuel gauge onboard	Included.	Included.	Included.	Included.	Included.	Included.	Included.	Included.
Overload Protection	✓	✓	✓	✓	✓	✓	✓	✓
Weight	.95 lbs.	1.33 lbs.	1.6 lbs.	1.54 lbs.	1.6 lbs	2.3 lbs.	2.33 lbs.	3.42 lbs.
All-weather performance	✓	✓	✓	✓	✓	✓	✓	✓
Watt Hours	36 Wh	54 Wh	72 Wh	90 Wh	90 Wh	108 Wh	144 Wh	216 Wh
High Output	No	Yes	No	No	No	Yes	Yes	Yes
Lithium-ion cells	18650	21700	18650	18650	18650	21700	21700	21700
Warranty	2 years	2 years	3 years	3 years	3 years	3 years	3 years	3 years

Milwaukee M18 2.0 Ah RedLithium CP2.0 Battery

The Milwaukee M18 2.0 Ah RedLithium CP2.0 Battery is the smallest and most budget-friendly option in the lineup, offering lightweight convenience and 2.0 amp-hours of runtime to enhance the performance and durability of your Milwaukee M18 cordless tools.

Product Specifications:

• Battery Type: 18 Volt Lithium Ion
• Amp Hour: 2 Ah
• Battery System: M18
• Voltage: 18V
• Warranty: 2 Year Limited Warranty

Shop Milwaukee’s M18 2.0Ah RedLithium CP2.0 Battery

Milwaukee M18 3.0 Ah RedLithium High Output CP3.0 Battery

The Milwaukee M18 3.0 Ah RedLithium High Output CP3.0 Battery Pack provides the same power as an M18 REDLITHIUM XC3.0 extended capacity battery but in a lighter and more compact package. This makes it perfect for tackling tight spots and overhead work, giving you the versatility you need for various tasks.

What sets it apart:

• Unmatched Power and Cooling: Offering the same power and runtime as an M18 REDLITHIUM XC battery but in a lighter and more compact package, this 18-volt battery delivers exceptional performance while staying cool even during heavy-duty applications.
• Fade-Free Power: Say goodbye to power fades; this battery provides consistent, fade-free power, ensuring your tools perform consistently throughout various applications.
• Full Compatibility: Fully compatible with all Milwaukee M18 solutions, it can power your cordless tools without limitations.

Product Specifications

• Battery Type: 18 Volt Lithium-Ion
• Amp Hour: 3 Ah
• Battery Line: HIGH OUTPUT
• Battery System: M18
• Voltage: 18V
• Warranty: 2 Year Limited Warranty
• Length: 5.31 in
• Weight: 1.33 lb
• Height: 2.31 in
• Width: 3.3 in

Shop Milwaukee M18 3.0Ah RedLithium High Output CP3.0 Battery Pack

Milwaukee M18 4.0 Ah RedLithium XC Extended Capacity Battery

The Milwaukee M18 4.0 Ah RedLithium XC Extended Capacity Battery Pack is reliable and is ideal for users who don’t prioritize weight when choosing a lower amp-hour option. While it provides up to 2 times more runtime, a notable 20% boost in power, and double the recharges compared to standard lithium-ion batteries, it may not be the best choice for those with all-day work demands. For users requiring extended usage, we recommend the higher amp-hour options for more sustained performance.

Product Specifications

• Battery Type: 18 Volt Lithium-Ion
• Amp Hour: 4 Ah
• Battery System: M18
• Voltage: 18V
• Warranty: 3 Year Limited Warranty

Shop Milwaukee M18 REDLITHIUM XC4.0 Extended Capacity Battery Packs

Milwaukee M18 5.0 Ah RedLithium XC5.0 Extended Capacity Battery

The Milwaukee M18 5.0 Ah RedLithium XC5.0 Extended Capacity Battery is a lithium-ion battery pack known for its versatility. It serves as a reliable workhorse for a wide range of users. This battery offers extended runtime, a 20% power increase, and increased recharges compared to standard lithium-ion batteries, making it a popular choice.

Product Specifications:

• Battery Type: 18 Volt Lithium-Ion
• Amp Hour: 5 Ah
• Battery Line: REDLITHIUM
• FULL Recharge Time Standard Charger: 105 min
• FULL Recharge Time Rapid Charger: 60 min
• Battery Branding: REDLITHIUM
• Oil Resistance: No
• FULL Recharge Time Super Charger: 60 min
• Fuel Gauge: Yes
• Runtime: 5 Ah
• Voltage: 18V
• Warranty: 3 Year Limited Warranty
• Length: 4.5 in
• Weight: 1.54 lb
• Height: 2.8 in
• Width: 3.1 in