A:AnswerPower capacity and charging voltage (120 VAC) have nothing to do with each other. Power capacity would be measured in watt-hours or some similar unit.
I do not know the number of watt-hours but the vacuum will run 14-15 minutes on a single charge. That is very good considering the necessarily high drain rate.
A:AnswerI'm not sure what the manufacturer says but I can tell you from experience that it is extremely poor. An infant sucking liquid through a straw has better pickup strength.