VRLA

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It has been suggested that this article or section be merged into Lead-acid battery. (Discuss)

VRLA stands for valve regulated lead acid and is the designation for maintenance-free lead-acid batteries. VRLA batteries can present several technologies such as:

These batteries are often colloquially called sealed lead-acid batteries, but this term is misleading: a sealed battery would be a safety hazard due to overpressure risks when overcharging, and there is always a safety valve present, hence the name valve-regulated. The name "valve regulated" does not really describe this technology. These are really "re-combinant" batteries. Which means that the Oxygen evolved at the positive will largely recombine with the Hydrogen ready to evolve on the Negative and thus prevent water loss. The Valve is only a safety feature in case hydrogen evolution crosses danger limits.

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