1. Maintenance (1) Regular supplementary charging. Generally, the discharged battery should be charged within 24 hours; for the battery on the stopped machine (or large equipment that is not in use), it must be recharged every month. The battery in use should be removed for supplementary charging every two months. (2) Regularly check the density of the electrolyte. The density of the electrolyte must be suitable for the region and season. According to practical experience, the relative density of the electrolyte of newly charged batteries can reach 1.20～1.25g/m3 in most areas of my country (except severe cold areas) before and after summer. When the used batteries are recharged, the relative density of electrolyte should be maintained. In 1.15 ~ 1.18g/cubic meter. The relative density of the electrolyte should be gradually increased from 1.18g/cubic meter to 1.25g/cubic meter in autumn, and adjusted to 1.285g/cubic meter in winter, and then gradually add distilled water during the Spring Festival to lower the relative density. (3) Maintain a certain height of the electrolyte level. According to the application requirements, the electrolyte level should be 10-15mm higher than the electrode plate. When checking, first use a glass tube with an inner diameter of 4-6mm and a length of about 150mm, vertically insert it into the filling port until it contacts the edge of the electrode plate, and then use your index finger to press the height of the electrolyte in the glass tube to be the electrolyte level in the battery. Higher than the height of the plate. After the measurement, put the electrolyte in the glass tube back. If the liquid level is not high enough, you should add distilled water in time. Never add spring water, river water, or tap water, let alone add dilute sulfuric acid, otherwise the electrolyte density will increase and the electrode will be damaged. board. It should also be noted that distilled water should be added when the battery is charging to ensure that the electrolyte mixes more evenly; the liquid level should not be too high to prevent electrolyte overflow during charging and discharging. (4) Remove the yellow-white paste on the shell cover in time. The yellow-white paste on the battery shell cover is the result of the electrochemical corrosion of the electrode pile due to the splash of sulfuric acid solution around the battery shell cover and the pole post. Among them, the white substance is lead sulfate and the yellow substance is iron sulfate, which is very corrosive and has a high resistance. If it is in contact with the wire, it will form a large contact resistance and cause poor conduction. For this reason, alkaline water should be used frequently, or cotton yarn soaked in 10% soda water or 10% ammonia solution can be used to clean the electrolyte splashed from the battery shell and cover, so that the surface is always neutral. If there is oxide in the gap between the pole and the wire joint, scrape it with a tool.