2.0Ah vs 3.0Ah vs 4.0Ah
Same fit: these run the same tools
Lowest price we track at UK retailers, updated daily. We may earn a commission
They differ in 5 of 6 areas
Same tools, so this is about size, weight and cost. No overall winner: pick the size that suits the job.
EnergyThe 4.0Ah stores 100% more than the 2.0Ah: 72Wh vs 36Wh.
WeightThe 2.0Ah is the lightest at 0.38kg, the 3.0Ah the heaviest at 0.64kg.
PriceThe 2.0Ah is the cheapest of the three today, at £49.95.
Price per Ah4.0Ah £17.49, 3.0Ah £19.98, 2.0Ah £24.98.
Size2.0Ah 113 × 75 × 45mm; 3.0Ah 113 × 75 × 62mm; 4.0Ah 113 × 75 × 62mm (L × W × H).
Good to know
Same toolsAll three fit every Makita 18V LXT tool, and pair up on the Makita 18V Twin (36V) tools.
Same chargersDC18RC, DC18RC/1, DC18RD, DC18RD/1, DC18SD and DC18SH charge all three. Charge times are in the specs below.
Energy
BL1820B
36Wh
BL1830B
54Wh
BL1840B
72Wh
Maker figure, or volts × Ah where they don't publish one. Ah and Wh explained ›
Weight
BL1820B
0.38kg
BL1830B
0.64kg
BL1840B
0.64kg
Price per Ah
BL1820B
£24.98
BL1830B
£19.98
BL1840B
£17.49
Lowest price we track ÷ Ah. Full specs
BL1820BBL1830BBL1840B
Voltage18V18V18V
Capacity2.0Ah3.0Ah4.0Ah
Energy36Wh54Wh72Wh
Weight0.38kg0.64kg0.64kg
Energy for its weight95Wh/kg (worked out)84Wh/kg (worked out)113Wh/kg (worked out)
ChemistryLi-ion (cylindrical)Li-ion (cylindrical)Li-ion (cylindrical)
Cell typeNot listedNot listedNot listed
Fuel gaugeYesYesYes
Size (L × W × H)113 × 75 × 45 mm113 × 75 × 62 mm113 × 75 × 62 mm
Charge time, DC18RC, DC18RC/1, DC18RD, DC18RD/124 min22 min36 min
Charge time, DC18SD, DC18SH45 min1 hr1 hr 30 min
Lowest price£49.95£59.95£69.95
Specs from each maker's own documentation. "Not listed" means the maker doesn't publish it or we haven't found it yet; it never counts as a difference.
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