Is the 4.0Ah battery worth it over the 3.0Ah?

Yes, if you want longer runtime. The 4.0Ah pack adds about a third more capacity than a 3.0Ah pack at a modest weight increase.

Will these fit my Makita 18V tools?

They fit any Makita 18V LXT tool and charger. They do not fit 12V CXT or 40V XGT tools.

Does the two-pack include a charger?

No. The BL1840B two-pack is batteries only. You need a Makita LXT charger, such as the DC18RC.

How long does one charge last?

It depends on the tool. Expect roughly 30 to 60 minutes of continuous use in a circular saw and much longer in drills and drivers.

Is $145.97 a good price for the two-pack?

At about $73 per battery, it is a fair price for genuine 4.0Ah LXT packs. Watch for counterfeit listings at much lower prices.

Where is the Makita BL1840B 2-pack cheapest?

At The Home Depot, for $259.00, as of our latest check.

Where can I buy the Makita BL1840B 2-pack?

2 stores we checked sell it, including The Home Depot, eBay.

Makita BL1840B 2-pack

Best price now

$259.00at The Home DepotObserved at 7:13 AM

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Our take on the Makita BL1840B 2-pack

The Makita BL1840B is a two-pack of Makita's 18V LXT 4.0Ah lithium-ion batteries, the mid-capacity pack in the LXT line. Each battery weighs about 21 oz and carries a 4.0Ah rating, so it runs longer than the 3.0Ah packs but is lighter than the 5.0Ah and 6.0Ah options. The best new price is $145.97 at eBay as of November 7, 2026, with two stores listing it new. That is roughly $73 per battery, in line with what 4.0Ah LXT packs typically cost.