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	Voltage A unit of measuring electrical pressure, all batteries are rated in volts DC (Direct Current).   Volumetric Energy Density The ratio of the energy output of a cell or battery to its volume (Wh/L).   Watts A measurement of energy, arrived at by multiplying the voltage by the amperage.   Watt Hours A common measurement of energy produced in a given amount of time, arrived at by multiplying the voltage by the amp hours.