Energy storage is best accounted for in watt-hours (Wh). Energy is measured in volts (V) x amp-hours (Ah) over a duration of time. So amp-hours is half of that equation. Amp-hours became a popular measurement of runtime because it was a given that it was being measured on a 12-volt battery. Our 6,000 Wh pack is a 140 Ah battery. It runs at 43 volts. So 43V x 140 Ah = 6,020 Wh. A 6,000 Wh battery could run a motor at 1,000 watts for 6 hours. If the battery was 36 volts instead: 36 x 140 Ah = 5,040 Wh. So it would run that same motor for 5 hours. To summarize: volts x amp-hours = watt-hours, and watt-hours tell the full story of energy storage.