Makita 18V 5.0Ah Replacement Battery BL1850B | Compatible with LXT 200+ Tools | High Capacity Li-Ion with Smart BMS Protection

Upgrade your Makita 18V LXT toolkit with this 5.0Ah high-capacity replacement battery. Compatible with 200+ tools, fast charge ready, and built with full BMS protection. Drop in and power on.

Product Description

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More Runtime. Less Downtime. Built for the Job Site.

Stop letting a dead battery slow you down. This 18V 5.0Ah high-capacity lithium-ion replacement battery is engineered to keep your Makita LXT tools running at full power — from the first task of the morning to the last one of the day.

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67% More Runtime Than a Standard 3.0Ah Battery

With 5,000mAh of capacity, this battery outlasts a standard 3.0Ah pack by up to 67%. That means fewer interruptions, fewer swaps, and more time doing the work that matters. Ideal for contractors, tradespeople, and serious DIYers who run their tools hard.

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Universal Fit Across the Makita 18V LXT Platform

Designed as a direct drop-in replacement for the Makita BL1850B, this battery connects instantly with all Makita 18V LXT slide-type tools — drills, circular saws, angle grinders, blowers, vacuums, and 200+ more. One battery. Your entire toolkit. No adapters, no fuss.

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Full Smart BMS Protection — Every Charge, Every Use

Built-in Battery Management System (BMS) actively monitors and protects against:

• Overcharging
• Over-discharging
• Short circuits
• Overheating

Your tools and battery stay safe, cycle after cycle.

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Fast Charge Compatible — Full Power in ~45 Minutes

Pair with a compatible Makita 18V fast charger and get back to a full charge in approximately 45 minutes. No long waits. No lost productivity.

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Built-In Charge Indicator — Always Know Your Levels

The onboard LED charge indicator lets you check remaining power at a glance — so you’re never caught off guard mid-cut or mid-drill.

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Consistent Power in Cold Conditions

Premium lithium-ion cells are engineered for stable discharge performance even in low-temperature environments. Reliable power no matter the season or job site conditions.

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Specifications

Feature	Details
Voltage	18V
Capacity	5.0Ah (5,000mAh)
Cell Type	Lithium-Ion
Compatible Model	Makita BL1850B
Compatible Platform	Makita 18V LXT (200+ Tools)
Connector Type	Slide-Type
Charge Time	~45 min (with fast charger)
Protection	Overcharge / Over-discharge / Short Circuit / Overheat

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In the Box

• 1 × 18V 5.0Ah Li-Ion Replacement Battery

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Key Features at a Glance

• 5.0Ah High Capacity — up to 67% more runtime vs 3.0Ah
• Direct replacement for Makita BL1850B — plug in and go
• Compatible with Makita 18V LXT platform (200+ tools)
• Built-in BMS: overcharge, over-discharge, short circuit & overheat protection
• Fast charge compatible — full charge in ~45 minutes
• LED charge level indicator built in
• Stable performance in cold weather conditions
• No adapter or modification required