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Glossary of Electrical Terminology

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Term Definition
VALVE A normally sealed mechanism which allows for the controlled escape of gasses from within a cell.
VENT A device which allows the escape of gasses from within a cell.
VOLTAGE EFFICIENCY A ratio of the average voltage during discharge to the average voltage during recharge, under specified conditions.
VOLTAGE SPREAD A term used to describe the difference between the highest and lowest individual cell voltage readings in a battery. For example, if in a 60 cell battery, the lowest cell read 2.20 Vdc and the highest cell read 2.30 Vdc, the voltage spread would be 0.10 V.
VRLA VALVE REGULATED LEAD ACID
A cell that is sealed and fitted with a valve which opens to vent the cell whenever the internal pressure of the cell exceeds the pressure external to the cell by a set amount.