The term "maintenance free" is a misnomer as VRLA batteries still require cleaning and regular functional testing. AGM batteries, on the other hand, offer fastest charging rate, offer long service life, and are maintenance-free.ĭue to their construction, the gel cell and AGM types of VRLA can be mounted in any orientation, and do not require constant maintenance. Since the heat produced on overcharge is lost more efficiently, they are suitable for deep cycle applications. The gel provides a better means of heat conduction from the plates to the cell walls than in AGM batteries. ![]() īoth types of VRLA batteries offer advantages and disadvantages compared to flooded vented lead–acid (VLA) batteries or each other. This additional layer absorbs the electrolyte and makes the battery non-spillable. AGM batteries feature fiberglass mesh or an ultra thin glass mat (called AGM separator) between the battery plates which serves to contain the electrolyte and separate the plates. Gel batteries can be made with either flat or tubular positive plates. This mixture forms a thick paste or gel, thereby giving the batteries the name - Gel Cell. ![]() ![]() The lead–acid gel batteries contain a mixture of sulfuric acid and finely divided silica. There are two primary types of VRLA batteries, absorbent glass mat ( AGM) and gel cell ( gel battery). A 12V VRLA battery, typically used in small uninterruptible power supplies and emergency lampsĪ 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 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.
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