I remember hooking a battery up to my motor, after every run in dirt, and dipping in pure trichloroethane to clean it. Brushed motor and sealed, back in the day. Nasty stuff. Probably already cost me some brain cells.
And Power is measured in Watts. The dimension of power is energy divided by time. So in basic terms, someone charging at 5 amps for 30 minutes should about equil someone charging at 40 amps for less than 4 minutes. At least in the ballpark. So a RC race track where everyone charged at 40 amps would use the same power as a race track where everyone charged at 5 amps. Or if 1 person eats a foot long in 5 minutes equals 2 people eating 2 6" in 2.5 minutes. Same Footlong.