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Term Definition

Conducting body in which active materials are placed and through which current enters or leaves cell.


In a lead-acid battery, the electrolyte is sulfuric acid diluted with water. It is a conductor and is also a supplier of hydrogen and sulfate ions for the reaction.

Electromotive Force (EMF)

Potential causing electricity to flow in a closed circuit.


That part of an atom having a negative charge.

End Of Discharge Voltage

The voltage of the battery at the termination of a discharge but before the discharge is stopped. See End Point Voltage (EPV).

End Of Life

The stage at which the battery or cell meet specific failure criteria.

End Point Voltage

Cell or battery voltage at which point the rated discharge capacity had been delivered at a specified rate-of-discharge. Also used to specify the cell or battery voltage below which the connected equipment will not operate or below which operation is not recommended. Sometimes called cutoff voltage or voltage end point.


Cell or battery output capability, expressed as capacity times voltage, or watt-hours (W-hr).

Energy Conversion

The change from chemical to electrical energy with the cell, or the reverse.

Energy Density

The ratio of cell or battery energy to either the weight (Wh/lb or Wh/kg) or the volume (Wh/L or Wh/cu.in.).


The process whereby gases generated in the cell carry electrolyte through the vent cap.

Environmental Conditions

External circumstances to which a cell or battery may be subjected, such as ambient temperature, humidity, shock, vibration and altitude.


See Reconditioning.

Equalization Charge

A maintenance procedure consisting of a sustained constant current charge used to correct cell imbalance.

External Power

A device that is used to supply electrical power via a cable and plug to the airframe external power receptacle. External power is used to prevent the aircraft batteries from being discharged during maintenance or often used for electrical power during engine starting. Some airframe external power electrical systems are designed to bypass the battery buss to prevent the batteries from being overcharged. To prevent the batteries from being overcharged, we recommend that the batteries be disconnected if the airframe external power electrical system design does not bypass the battery buss when external power is on in excess of four hours. External power should not be set higher than 2.38 volts per cell, 14.2 for 12 volt batteries and 28.5 DCV for 24 volt batteries.


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