2.5Ah 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 5 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 60% more than the 2.5Ah: 48Wh vs 30Wh.
WeightThe 2.5Ah is the lightest at 0.2kg, the 4.0Ah the heaviest at 0.4kg.
PriceThe 3.0Ah is the cheapest of the three today, at £29.95.
Price per Ah3.0Ah £9.98, 4.0Ah £9.99, 2.5Ah £13.18.
Chemistry2.5Ah: Li-ion; 3.0Ah: Li-ion; 4.0Ah: Li-ion (cylindrical).
Good to know
Same toolsAll three fit every Milwaukee M12 tool.
Same chargersM12-18FC, M12-18GBC4, C12C, M12-18AC and M12C4 charge all three. Charge times are in the specs below.
Energy
M12HB2.5
30Wh
M12B3
36Wh
M12B4
48Wh
Maker figure, or volts × Ah where they don't publish one. Ah and Wh explained ›
Weight
M12HB2.5
0.2kg
M12B3
0.2kg
M12B4
0.4kg
Price per Ah
M12HB2.5
£13.18
M12B3
£9.98
M12B4
£9.99
Lowest price we track ÷ Ah. Full specs
M12HB2.5M12B3M12B4
Voltage12V12V12V
Capacity2.5Ah3.0Ah4.0Ah
Energy30Wh36Wh48Wh
Weight0.2kg0.2kg0.4kg
Energy for its weight150Wh/kg (worked out)180Wh/kg (worked out)120Wh/kg (worked out)
ChemistryLi-ionLi-ionLi-ion (cylindrical)
Cell typeNot listedNot listedNot listed
Fuel gaugeNot listedYesYes
Size (L × W × H)Not listedNot listedNot listed
Charge time, M12-18FC, M12-18GBC440 min50 min52 min
Charge time, C12C, M12C455 min1 hr 10 min1 hr 20 min
Charge time, M12-18AC55 min1 hr 30 min1 hr 55 min
Lowest price£32.95£29.95£39.95
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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