Which battery lasts longer on a single charge?

The BL1850B 5.0Ah. It holds 90Wh versus 2.0Ah for the BL1820B, so expect roughly 2.5 times the runtime.

Is the 5.0Ah worth the extra $50?

Yes if you use saws, grinders or other high-draw tools. For drills and light work, the 2.0Ah saves money and weight.

Which is better for overhead work?

The BL1820B 2.0Ah. At about 380 g it is roughly half the weight of the 0.63 kg 5.0Ah pack.

Do both fit the same Makita tools?

Both are 18V LXT packs. The 5.0Ah requires tools with the Star Symbol or a yellow battery receiver.

How fast do they charge?

The 5.0Ah reaches full charge in 45 minutes or less on a Makita fast charger. The smaller 2.0Ah charges faster still.

Makita BL1850B 18V LXT 5.0Ah Battery vs Makita 18V LXT 2.0Ah Battery

Buy the BL1850B 5.0Ah if you want maximum runtime and fewer charger trips; it costs $97.49 at Amazon as of November 7, 2026. Buy the BL1820B 2.0Ah if you want a lighter pack for drilling and overhead work; it costs $47.95 at Amazon as of November 7, 2026. The 5.0Ah costs about $50 more but delivers roughly 2.5 times the energy.

Today the Makita 18V LXT 2.0Ah Battery costs $49.54 less at its best price.

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