The plug on top of a cell. It can be removed to allow for electrolyte level adjustments.

A normally sealed mechanism which allows the controlled escape of gases from within a cell.

A heavy duty cell design in which the vent operates at low pressures during the normal duty cycle to expel gases generated in overcharge. A vented cell plate pack contains flat plates, separated by a gas barrier and woven nylon separator, completely immersed in electrolyte. Often called a 'flooded cell.'

A release of gas either controlled (through a vent) or accidental.

Unit of electromotive force, voltage or potential. The volt is the voltage between two points of a conductor carrying a constant current of one ampere, when the power dissipated between these points is one watt.

In a charge controlled battery, limit beyond which battery potential is not permitted to rise during or after the charging process.

In a charge controlled battery, limit beyond which battery potential is not permitted to rise during or after the charging process.