Voltage
A unit of measuring electrical pressure, all batteries are rated in volts DC (Direct Current).

Voltage Depression
An abnormal drop in voltage below expected values during the discharge of a battery.

Voltage Delay
Time delay for a battery to deliver the required operating voltage after it is placed under load.

Voltage-Keyed
A system that incorporates a mechanical identifier on batteries and devices to ensure only batteries of the correct voltage are connected to the device.

Voltage Regulator
A device that regulates the output of a generator or alternator by controlling the current and voltage.

Voltage Reversal
The changing of the normal polarity of a battery due to overdischarge.

Volumetric Energy Density
The ratio of the energy output of a cell or battery to its volume (Wh/L).