Milwaukee M18B5.5 18V 5.5Ah Redlithium-Ion Slide Battery

Milwaukee M18B5.5 18 V REDLITHIUM 5.5 Ah Slide Battery Pack

The Milwaukee M18B5.5 is a high-output 18 V lithium-ion battery pack engineered to deliver reliable, long running power across the full range of M18 cordless tools. Whether you’re cutting, drilling, grinding or performing heavy-duty tasks on site — this battery gives you the performance and endurance required for extended work without constant recharging.

Built with Milwaukee’s advanced REDLITHIUM™ battery technology and protected by REDLINK™ intelligence electronics, the M18B5.5 ensures consistent power delivery even under load, withstands tough job-site conditions and delivers cooler, longer operation under demanding applications. :contentReference[oaicite:1]{index=1}

• High output & increased runtime: up to 50 % more power and runtime compared with older M18 batteries — great for heavy-duty jobs or long working days. :contentReference[oaicite:2]{index=2}
• Slide-on pack design: quick and secure mounting — works with all M18 cordless tools for plug-and-play compatibility. :contentReference[oaicite:3]{index=3}
• Durable build with metal frame and shock-resistant separators: withstands vibration, drops and tough job-site conditions for enhanced reliability. :contentReference[oaicite:4]{index=4}
• Individual cell monitoring & overload protection: REDLINK electronics protect both battery and tool under heavy load, extending lifespan. :contentReference[oaicite:5]{index=5}
• Runs cooler under heavy load: thanks to improved internal design, the battery maintains stable output over longer durational use. :contentReference[oaicite:6]{index=6}
• Wide temperature tolerance: performs reliably on sites even in challenging weather or cold conditions (typical of professional work environments). :contentReference[oaicite:7]{index=7}
• On-board fuel gauge: gives a quick visual indication of remaining charge — handy for busy jobs when runtime matters. :contentReference[oaicite:8]{index=8}

Whether you’re using drills, grinders, impact tools, saws, or other M18 gear — the M18B5.5 delivers dependable, long-lasting power so you can work longer with less downtime. A solid choice for tradespeople, contractors, or DIYers who demand endurance and consistency from their cordless tools.