A: The colloid solves the problem of electrolyte layering. For batteries in which the electrolyte is in a non-gel state, the electrolyte layering is affected by gravity. As a result, the negative electrode plate in the lower part is easily sulfated, and the upper grid is easily corroded. The colloid is added into the battery after high-speed stirring. Due to the thixotropic nature of the colloid, the gel rapidly forms a mesh-like whole.