A valve regulated lead–acid (VRLA) battery, commonly known as a sealed lead–acid (SLA) battery,[1] is a type of lead–acid battery characterized by a limited amount of electrolyte ("starved" 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.[2]
There are two primary types of VRLA batteries, absorbent glass mat (AGM) and gel cell (gel battery).[3] Gel cells add silica dust to the electrolyte, forming a thick putty-like gel. AGM (absorbent glass mat) batteries feature fiberglass mesh between the battery plates which serves to contain the electrolyte and separate the plates. Both types of VRLA batteries offer advantages and disadvantages compared to flooded vented lead–acid (VLA) batteries or each other.[4]
Due to their construction, the gel cell and AGM types of VRLA can be mounted in any orientation, and do not require constant maintenance. The term "maintenance free" is a misnomer as VRLA batteries still require cleaning and regular functional testing. They are widely used in large portable electrical devices, off-grid power systems and similar roles, where large amounts of storage are needed at a lower cost than other low-maintenance technologies like lithium ion.
^Eismin, Thomas K. (2013). Aircraft Electricity and Electronics (Sixth ed.). McGraw Hill Professional. p. 48. ISBN 978-0071799157.
^Linden, David B.; Reddy, Thomas (2002). "24". Handbook of Batteries Third Edition. McGraw-Hill. ISBN 0-07-135978-8.
^"Selecting the Proper Lead–Acid Technology" (PDF). Trojan Battery Company, California, USA. 2018. Archived (PDF) from the original on 2023-09-29. Retrieved 2023-09-29.
valve regulated lead–acid (VRLA) battery, commonly known as a sealed lead–acid (SLA) battery, is a type of lead–acid battery characterized by a limited...
regulated lead–acid battery (VRLAbattery) is popular in the automotive industry as a replacement for the lead–acid wet cell. The VRLAbattery uses an immobilized...
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recombining genetic material VRLA – a valve regulated lead acid (VRLA) battery that is also referred to as a recombinant battery InSoc Recombinant – an album...
lead-acid battery (VRLA) is a battery type that is popular in telecommunications network environments as a reliable backup power source. VRLAbatteries are...
belief revision Absorbent glass mat, a technology used in some models of VRLAbattery Aorta-gonad-mesonephros, a part of chicken, mouse, and human embryos...
Battery electric vehicles are vehicles exclusively using chemical energy stored in rechargeable battery packs, with no secondary source of propulsion...
in years i VRLA or recombinant includes gel batteries and absorbed glass mats p Pilot production Several types of lithium–sulfur battery have been developed...
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reflected here. Battery nomenclature Experimental rechargeable battery types Aluminium battery List of battery sizes List of battery types Search for...
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joint program called Destination Zero Carbon. In 2013 the Hydro max VRLAbattery charger for recreational vehicles and yachts were released, and Aquiline...
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mat (AGM), flooded, enhanced flooded battery, and gel (VRLA) technologies. Exide also markets lithium-ion batteries for motorbikes in Europe. Exide serves...
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