The battery of Mercedes is under the front cover of the front windshield on the right side of the cabin, and you only need to open the hood to see the battery. Its working principle is mainly to use the lead plate filled with spongy lead as a negative electrode, the lead plate filled with lead dioxide as a positive electrode, and 22~28% dilute sulfuric acid as an electrolyte. When charging, electrical energy is converted into chemical energy, and when discharging, chemical energy is converted into electrical energy.