Makita BL1840B 18V 4.0Ah Li-Ion Battery

The Makita BL1840B is a high-capacity 18V 4.0Ah lithium-ion battery that delivers extended runtime for demanding cordless tools. Unlike standard 3.0Ah packs, this 4.0Ah unit provides up to 33% more work per charge, while the integrated 4-stage LED fuel gauge lets you monitor remaining power at a glance. Slide-style mounting and Star Protection Computer Controls ensure seamless integration with Makita 18V LXT tools, protecting against overload, over-discharge, and overheating.

Highlights

• 4.0Ah capacity for longer runtime
• 4-stage LED charge level indicator
• Star Protection Computer Controls for tool and battery protection
• Low self-discharge rate for extended storage
• No memory effect, ready to charge anytime
• Compatible with all Makita 18V LXT cordless tools

In daily use

The BL1840B excels in high-drain applications such as circular saws, angle grinders, and hammer drills. Rapid charging with the DC18RC charger takes approximately 36 minutes, minimizing downtime. The battery's slide-style design ensures a secure connection, and the LED gauge provides clear feedback during operation.

Full specifications

• Battery Type: Lithium-Ion (Li-Ion)
• Voltage: 18 V
• Capacity: 4.0 Ah
• Energy Rating: 72 Wh
• Charging Time (Rapid Charger): Approx. 36 minutes (with DC18RC)
• Integrated Fuel Gauge: Yes (4-stage LED indicator)
• Protection System: Makita Star Protection Computer Controls
• Overload Protection: Yes
• Over-Discharge Protection: Yes
• Overheating Protection: Yes
• Mount Type: Slide-style
• Memory Effect: No
• Self-Discharge Rate: Low
• Product Series: LXT

Final note

For professionals and serious DIYers, the Makita BL1840B delivers reliable power and advanced protection, making it a smart investment for your 18V LXT tool system.