By changshu wanlong -
June 22, 2022 -
1 minute, 52 seconds -
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Sealed VRLA or valve-regulated lead-acid batteries (AGM and Gel) work the same way as flooded batteries but are sealed in a leak-proof casing and the electrolyte is in a non-liquid form.
VRLA batteries use a gas recombination system that combines the gases produced during the charge/discharge process back into the battery. This prevents nearly all electrolyte loss (close to 99%) through outgassing. These batteries are therefore not serviceable or maintenance-free as they are sealed and have no chance of acid spillage. This means they are also safer and easier to handle and transport than flooded batteries.
AGM batteries use the VRLA system but store the electrolyte in absorbent glass mats between lead calcium plates. This is the most cost-effective type of VRLA battery and has become very popular in recent years. However, the cycle life (lifetime) of such batteries can be very low compared to flooded and gel batteries, typically 6-10 years.
Gel batteries use a VRLA system but have a gel electrolyte, which is made using a special gelling agent to create a thick stationary electrolyte. Gel batteries are known to perform very well at high discharge rates and generally last longer than AGM batteries, but they are generally more expensive.
