Valve regulated lead–acid battery, commonly known as a sealed lead–acid battery, is a type of lead–acid battery characterized by a limited amount of electrolyte absorbed in a plate separator or formed into a gel; proportioning of the negative and positive plates so that oxygen recombination is facilitated within the cell; and the presence of a relief valve that retains the battery contents independent of the position of the cells.
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The modern gel or VRLA battery was invented by Otto Jache of Sonnenschein in 1957.
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VRLA battery cells have the same chemistry, except the electrolyte is immobilized.
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In contrast, VRLA batteries retain generated gases within the battery as long as the pressure remains within safe levels.
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Each cell in a VRLA battery has a pressure relief valve which will activate when the battery starts building pressure of hydrogen gas, generally a result of being recharged.
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Originally a kind of gel VRLA battery was produced in the early 1930s for portable valve radio LT supply by adding silica to the sulfuric acid.
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The lighter, smaller VRLA battery can be installed at an odd angle if needed for the design of the motorcycle.
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VRLA battery batteries are used extensively in power wheelchairs, as the extremely low gas and acid output makes them much safer for indoor use.
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VRLA battery batteries are used in the uninterruptible power supply as a backup when the electrical power goes off.
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VRLA battery batteries are the standard power source in sailplanes, due to their ability to withstand a variety of flight attitudes and a relatively large ambient temperature range with no adverse effects.
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VRLA battery batteries are used in the US Nuclear Submarine fleet, due to their power density, elimination of gassing, reduced maintenance, and enhanced safety.
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Relative to VRLA in telecommunications, the use of VRLA Ohmic Measurement Type Equipment and OMTE-like measurement equipment is a fairly new process to evaluate telecommunications battery plants.
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The VRLA battery can be mounted in any position, since the valves only operate on over-pressure faults.
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Since the VRLA battery system is designed to be recombinant and eliminate the emission of gases on overcharge, room ventilation requirements are reduced, and no acid fume is emitted during normal operation.
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