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valve regulated battery (vrla)

An entirely different way of controlling fluid loss goes under the generic name of VRLA, Valve Regulated Lead-Acid. In this case the battery box is designed as a small pressure vessel with safety valves. If you confine the oxygen and hydrogen gases, they can react with each other and be reformed into water. This is called recombination and is a brilliant way of all but eliminating fluid loss. It is not possible to confine and recombine all the gas but the loss is reduced dramatically.

VRLA is available in two main designs, GEL or AGM (Vlies) which are constructed in totally different ways.

 

Läs om ventil reglerat på svenska.