Microbubbling is the result of electrolysis, where current passes between the positive and negative terminals within the battery and breaks the water molecules into hydrogen and oxygen gases.When microbubbling stops, the high voltage battery has been discharged.WARNINGSThis process produces flammable hydrogen gas and oxygen, which can be potentially explosive in confined spaces.Venting the passenger compartment may be necessary to reduce gas buildup.Never remove a submerged service disconnect!