The withdrawal of electrical energy from a battery.

Discharging a battery to 20 percent or less of its full charge capacity.

The ampere-hours removed from a fully charged cell or battery, expressed as a percentage of rated capacity.

For example, the removal of 25 ampere-hours from a fully charged 100 ampere-hours rated cell results in a 25 percent depth of discharge.

Under certain conditions, such as discharge rates lower than that used to rate the cell, depth of discharge can exceed 100 percent.

A number equivalent to the time in hours during which a battery is discharged at constant current usually expressed as a percentage of the total battery capacity; for example, C/5 indicates a discharge factor of 5 hours. Related to discharge rate.

The rate, usually expressed in amperes or time, at which electrical current is taken from the battery.

An adjustment factor used in some system sizing procedures which "allows" the battery to be gradually discharged over a 30-90 day period of poor solar insolation.

This factor results in a slightly smaller photovoltaic array.

The rate at which a battery, without a load, will lose its charge.