Tags: Why does the maintenance-free battery lose water? The maintenance-free battery does not need to add water and electrolyte during the normal service life, which is the biggest feature of the maintenance-free battery. However, some users will lose water in the battery and cause the battery to fail during use. What is the reason? This is mainly due to the following reasons? 1. When the maintenance-free battery is used for floating charge, the voltage of the floating charge is too high, which causes the electrolyte to decompose and fail. 2. The use environment of the battery is too high, and the heat generated by the battery during the charging process cannot be diffused into the air in time, which accelerates the loss of electrolyte. At the same time, due to reasons such as the density of the battery case, the battery is prone to lose moisture through the case when the battery is in a high temperature and dry environment for a long time. 3. When the output voltage of the charger is higher than its designed voltage, this high voltage will generate a larger charging current for the battery. Almost all the electrical energy at this time is wasted on the electrolysis of water. After the battery is fully charged, if it is overcharged for 1h with 1A current, 0.336g of water will be electrolyzed, and 0.418L of hydrogen and 0.209L of oxygen will be released at the same time. If the overcharge current causes the electrolyte to boil and produce a large amount of acid mist, it will accelerate the battery's water loss. 4. The efficiency of gas recombination is low; the temperature rises and water seeps out from the battery shell; the grid corrosion consumes water; the rate of self-discharge loss of water increases. From the above situation, maintenance-free batteries must be used correctly to avoid high temperatures, so that the battery life will be long.