Makita 18V LXT 4.0Ah Battery – BL1840B | Fast Charge, Lightweight

Power and reliability for your 18V Makita tools

The Makita BL1840B 18V LXT lithium‑ion battery combines dependable capacity with smart design, giving you the freedom to work across a range of tools without constant changes. With a 4.0Ah rating, this battery is built to provide steady, durable power while keeping a comfortable balance in your hand.

Efficient performance in a compact package

Despite the higher capacity, the BL1840B maintains a similar weight to a 3.0Ah model. This thoughtful balance supports fatigue‑free use during longer sessions. Foam cell technology helps manage heat, keeping performance steady even as workloads peak.

• Foam cell technology supports balanced power delivery and heat management
• Slide‑on contact and a shock‑absorbing pack for a secure, resilient connection
• Fast 36‑minute charge time under optimal conditions
• Same weight as the 3.0Ah battery for comfortable handling
• Built to work with your existing Li‑ion chargers, streamlining your setup

Real‑world use cases

From on‑site carpentry to home DIY projects, this battery keeps up with tools you trust. The blend of higher capacity and quick charging helps reduce downtime between tasks, letting you stay focused on the job at hand.

• Longer run time across compatible 18V tools
• Cool operation under heavy use, supporting steadier performance
• Consistent power that maintains reliability through storage and use

Compatibility and care

Designed for the Makita 18V LXT ecosystem, the BL1840B works with a wide range of 18V Li‑ion chargers. For best results, store and charge in appropriate conditions to help maximize lifespan and readiness for the next task.