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Ive been powering things with drill batteries for a while now, I recommended one with built in low voltage protection and 12 power supply to make things a bit easier.
Watt hours is the true measure of the energy capacity of a battery
18v X 3 AH is 48 Whrs
12v X 10 Ahrs is 120 Whrs
The latter is a much bigger battery and unless there is a seriously janky power supply internal to your device, it will last longer (assuming a 12v device that is also compatible with 18v).
One has to be carefull of some of these amazon battery powersupplies, they sometimes rate the cell capacity before the power supply.
For example the box says 5Ahr capacity and 12v capability. Really it may be a 5AH 4 volt cell that can only output around 1.3 Ah @12v after the voltage is stepped up by the internal power supply. Whrs eliminates this marketing dishonest, though they sometime report optimistic numbers for this as well
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84 930
18 Cayman GTS
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