VRLA (regulated lead-acid valve) uses AGM technology (glass fiber separators). AGM separators separate the positive and negative plates by absorbing the electrolyte. The immobilization of the electrolyte in the AGM separator maintains firm contact between the plates, which is a fundamental requirement for VRLA batteries. The use of the AGM separator facilitates the transfer of oxygen gas generated on the positive plate during charging to the negative plate. During the chemical reaction of the internal recombination of the gases, the hydrogen and oxygen create water again, thus preventing the loss of electrolyte.

Differences between VRLA batteries and traditional liquid electrolyte batteries    

• Liquid electrolyte batteries do not have special sealed and pressurized valves, as they do not work on the principle of with the recombination principle (gases escape from inside the battery during charging)

• Contain liquid electrolyte that can spill / flow and cause corrosion if dropped or punctured.Therefore, they cannot be transported by air without special containers.

• They can only be installed “in the vertical position” and the “acid protection” must be maintained at the same time.
• As liquid electrolyte batteries lose gases during charging, periodic maintenance is required periodically.

• As the electrolyte can flow, “electrolyte replenishment” takes place and needs more overcharging to mix.