In automobile batteries, electrolyte mainly plays the role of electrochemical reaction and conductivity, as follows: 1. Electrochemical reaction can make the battery discharge normally only in the presence of electrolyte, because the electrode plate releases electric energy by absorbing sulfuric acid in electrolyte. 2. A current loop can be formed in the battery through electrolyte conduction, so that the current can be charged and discharged in the battery. About lithium battery electrolyte: Lithium battery electrolyte is the carrier of ion transmission in lithium battery, which is mainly composed of lithium salt and organic solvent. For automobile batteries, there is no need to add electrolyte in the later period of maintenance-free batteries. If the maintainable battery feels that the power is useless, electrolyte can be added appropriately. When adding electrolyte to the battery, the battery must be kept still for about 6 hours until the electrolyte temperature is lower than 35 degrees Celsius before charging the battery.