Gelled batteries are VRLA batteries which use an electrolyte that has been thickened to the consistency of petroleum jelly by the addition of a silica agent. The agent allows the electrolyte’s water to bind with the acid. Once inside, the gel undergoes a chemical reaction, heats up, and liquefies. During the cool-down phase, the gel solidifies and tiny hairline cracks form between the gel and the battery’s plates. During the charging, oxygen gas from the positive plate combines with the hydrogen gas on the negative plate inside of the cracks, producing water. The gelled electrolyte will then absorb the water, which keeps the closed system hydrated.

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