A valve regulated lead acid (VRLA) battery is also known as sealed lead–acid (SLA) battery is a type of lead-acid battery. In this type of battery, the electrolyte that does not flood the battery but it’s rather absorbed in a plate separator or silicon is added to form a gel.
In sealed lead-acid batteries it normally is absorbent glass fiber to hold the electrolyte in suspension. Sealed lead-acid battery, generally having the following charac-teristics: Maintenance-free, leak-proof, position-insensitive. Batteries of this type have a safety vent to release gas in case of excessive internal pressure build-up.
A lead acid battery is made of a number of lead acid cells wired in series in a single container. Lead acid cells have two plates of lead hung in a fluid-like electrolyte solution of sulfuric acid. While in use, the battery generates power by reducing the lead plates, turning them into lead-sulfuric-oxide.
Power-Sonic rechargeable sealed lead-acid batteries are designed to provide years of dependable service. Adherence to the following guidelines in system design will ensure that battery life is maximized and operation is trouble-free. Continuous over-or undercharging is the single worst enemy of a lead-acid battery.
Hence also the term: Valve regulated battery. “Gel Cells” are SLAbatteries whose dilute sulfuric acid elec-trolyte is immobilized by way of additives which turn the elec-trolyte into a gel. An application in which the battery is maintained in a fully charged condition by trickle of float charging.
In practice, the recombination efficiency is not 100% and a pressure relief valve regulates the internal pressure at a relatively low value, generally below 10 psig. For this reason, sealed lead-acid cells are often called “valve-regulated lead-acid” (VRLA) cells.
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