Milwaukee M18™ 5.0Ah REDLITHIUM™ Battery (M18 B5)

Milwaukee M18™ 5.0Ah REDLITHIUM™ Battery (M18 B5)

When the day starts early and the job runs long, you need power you can trust — not just for minutes, but for the entire shift. The Milwaukee M18™ 5.0Ah REDLITHIUM™ Battery is built for professionals who demand consistent performance, intelligent protection, and durability that stands up to real-world site conditions.

Designed as the backbone of the M18™ cordless system, this battery delivers up to 2.5x more runtime, up to 20% more power, and up to 2x longer battery life compared to previous lithium-ion technologies. Whether you’re driving fixings, cutting materials, grinding metal, or finishing work, it provides the steady, reliable energy needed to keep productivity high and downtime low.

At its core is REDLITHIUM™ technology, paired with REDLINK™ digital overload protection. This intelligent system constantly monitors individual cells, preventing overloading, overheating, and deep discharge — protecting both the battery and your tools from damage in demanding applications. The result is longer service life, safer operation, and dependable output under load.

Built for the harsh realities of professional use, the M18 B5 features a durable metal frame construction with shock-responsive separators, helping prevent internal damage from drops, vibrations, and site impacts. Integrated water protection channels divert moisture away from sensitive electronics, while the battery continues to perform in extreme temperatures down to -20°C, making it a reliable choice year-round.

An on-board fuel gauge provides instant visibility of remaining charge, allowing you to plan your work more efficiently and avoid unexpected interruptions. When it’s time to recharge, the battery is compatible with the full range of Milwaukee M12™–M18™ chargers, offering flexible charging times depending on your setup.

As part of the Milwaukee M18™ system, this 5.0Ah battery is compatible with over 315 cordless tools, giving you one battery platform that adapts as your kit grows. It’s an ideal choice as a replacement battery, an upgrade from lower-capacity packs, or a reliable spare to keep your tools working without pause.

Key Features & Benefits

• High-capacity 5.0Ah REDLITHIUM™ battery for extended runtime

• REDLINK™ digital overload protection safeguards tools and battery

• Individual cell monitoring for optimal charge and discharge

• Durable metal frame construction resists impacts and vibrations

• Water protection design shields internal electronics

• Performs in temperatures as low as -20°C

• Integrated fuel gauge for quick charge status checks

• Compatible with the full Milwaukee M18™ cordless system

Ideal For

• Professional tradespeople

• Site work and workshop use

• Users running multiple M18™ tools

• Anyone needing longer runtime and dependable cordless power

What’s Included

• 1 × Milwaukee M18™ 5.0Ah REDLITHIUM™ Battery (M18 B5)