During storage, the battery will self-discharge more or less. Normal storage batteries, each stored for 1 day, the electrical energy capacity loss of about 1% to 2%, that is, a fully charged battery, storage for 1 month, the electrical energy capacity is about half of the loss. First, the cause of self-discharge? 1. The battery outside the ground or short circuit. When the battery lead leads to the body ground, or the battery casing has a wrench, wire and other conductors to connect the positive and negative poles, will have a violent self-discharge, and quickly put the power out. In addition, when there is splashed electrolyte on the battery case and the top cover, the positive and negative terminals can also be connected and discharged. 2. The accumulator separator is corroded and damaged, or there are too many deposits under the positive and negative plates. At this time, the positive and negative plates are directly connected and short-circuited, causing the battery to discharge itself. 3. Impure electrolyte, impurities, or pure water is not added. At this time, the impurities in the electrolyte adhere to the plate with the flow of the electrolyte, and a certain potential difference forms between the impurities. Many tiny batteries with self-contained passages are formed inside the battery, so that the battery is often in a short circuit state. Tests have shown that if the electrolyte contains 1% of iron, the battery will be fully discharged within 24 hours after the battery is fully charged. 4. The battery plate itself is impure and contains many impurities. It also forms many tiny batteries and discharges itself. 5. When the battery is stored for too long, the water and sulfuric acid in the electrolyte are layered due to the difference in specific gravity, so that the electrolyte density is small and large, forming a potential difference and self-discharge. Second, preventive measures 1.? Strengthen maintenance, keep the battery cover clean. 2. Ensure that the electrolyte has a high purity. When preparing the electrolyte and adding distilled water, prevent impurities from entering. 3. The battery should be charged during the storage process so that the density of the electrolyte is kept even and the liquid level will not be reduced. 4. When rinsing the outside of the battery, prevent sewage from entering the inside of the battery from the filler cap or vent hole. 5. When the diaphragm or plate is damaged, it should be repaired or replaced in time. 6. When replacing the electrolyte, be sure to clean the residual liquid in the battery.