New energy vehicles generally travel 150-200 kilometers on a single charge. During the charging process, the temperature of the electrolyte should be measured by halving the current, stopping the charging or cooling, and the temperature should be controlled at 35~40° C. When the initial charging is completed, if the specific gravity of the electrolyte is not specified, the distilled water or the electrolyte with a specific gravity of 1.4 should be adjusted. Charge 2h after adjustment until the proportion meets the requirements.