Specs from the makers' own documentation Battery compatibility built in UK retailer prices, updated daily 25+ years of trade experience
Battery comparison
2 of 3 batteries

2.5Ah vs 5.0Ah

Same fit: these run the same tools
MIRKA 10.8V
2.5Ah 8991122211 2.5Ah · 27Wh · 0.18kg
No retailer price yet
MIRKA 10.8V
5.0Ah 8991122311 5.0Ah · 54Wh · 0.38kg
No retailer price yet
+ Add a battery Room for one more.

They differ in 2 of 3 areas

Same tools, so this is about size, weight and cost. No overall winner: pick the size that suits the job.

EnergyThe 5.0Ah stores 100% more than the 2.5Ah: 54Wh vs 27Wh.
WeightThe 2.5Ah is the lightest at 0.18kg, the 5.0Ah the heaviest at 0.38kg.

Good to know

Same toolsBoth fit every Mirka 10.8V tool.
Same chargers8991123011 charge both. Charge times are in the specs below.
Energy
8991122211 27Wh
8991122311 54Wh
Maker figure, or volts × Ah where they don't publish one. Ah and Wh explained ›
Weight
8991122211 0.18kg
8991122311 0.38kg

Full specs

89911222118991122311
Voltage10.8V10.8V
Capacity2.5Ah5.0Ah
Energy27Wh54Wh
Weight0.18kg0.38kg
Energy for its weight150Wh/kg (worked out)142Wh/kg (worked out)
ChemistryLi-ionLi-ion
Cell typeNot listedNot listed
Fuel gaugeNot listedNot listed
Size (L × W × H)Not listedNot listed
Charge time, 899112301150 min1 hr 40 min
Lowest priceNo retailer price yetNo retailer price yet

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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