Does the BL1840B fit all Makita 18V tools?

Yes. It is an 18V LXT pack and fits Makita 18V LXT drills, saws, grinders and outdoor tools, and charges on LXT chargers.

Is 4.0Ah enough for heavy use?

It suits drills, drivers and light saw work. For grinders or long saw cuts, a 5.0Ah or larger pack gives more runtime.

How is it different from the 3.0Ah pack?

It has one more amp-hour of capacity, so roughly a third more runtime, at a bit more weight and cost.

Does it come with a charger?

No. This is a single battery only; chargers are sold separately.

Battery prices move with promos and kit bundles. The best new price was $76.97 at eBay as of November 7, 2026.

Where is the Makita BL1840B cheapest?

At eBay, for $76.97, as of our latest check.

Where can I buy the Makita BL1840B?

3 stores we checked sell it, including eBay, The Home Depot, Ace Hardware.

Makita BL1840B

Best price now

$76.97at eBayVerified

Compared across 2 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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Our take on the Makita BL1840B

The Makita BL1840B is a single 18V LXT lithium-ion battery pack rated at 4.0Ah. It uses Makita's 4-cell design with a built-in charge level indicator and fits the full 18V LXT line of drills, saws, grinders and outdoor tools. It has no memory effect and works with Makita's 18V chargers. The best new price is $76.97 at eBay as of November 7, 2026, with two stores listing it new.