The YH Yunhai Zhicheng series valve regulated sealed lead-acid batteries are widely used in communication systems, power systems, emergency lighting systems, automation control systems, fire and safety alarm systems, solar and wind energy systems, computer backup power supplies, portable instruments, meters, medical system equipment, electric vehicles, power tools, etc. characteristic: 1. Long term discharge characteristics. 2. Suitable for use with backup and energy storage power sources. 3. Special electrode plate design, long cycle life. 4. The special lead calcium alloy formula enhances the corrosion resistance of the grid and extends the service life of the battery. 5. The dedicated partition enhances the internal performance of the battery. 6. With a large heat capacity, it reduces the risk of thermal runaway and is not easily dried up, making it suitable for use in harsh environments. 7. High gas recombination efficiency. 8. Water loss is extremely rare and there is no electrolyte layering phenomenon. 9. The storage period is relatively long. 10. Good deep discharge recovery performance. 11. Use gas-phase silica with small particle size and large specific surface area. The two sets of plates of a lead-acid battery undergo a chemical change when inserted into a dilute sulfuric acid solution, resulting in the generation of voltage. When direct current is applied (charging), the lead oxide on the positive electrode plate turns into brown lead dioxide (PbO2), and the lead oxide on the negative electrode plate turns into gray fluffy lead (Pb, also known as sponge like lead). When a lead-acid battery is discharged, the active substances on both the positive and negative plates absorb sulfuric acid and undergo a chemical change, gradually becoming lead sulfate (PbSO4). When the active substances on both the positive and negative plates become the same lead sulfate, the voltage of the battery drops to the point where it can no longer be discharged. At this point, it is necessary to charge the battery to restore it to its original state of lead dioxide and fluffy lead, so that the battery can continue to discharge. Charging method First time charging. New or long-term inventory batteries need to undergo initial discharge before use, with the following steps: ① First, unscrew the water cap and remove the seal on the small hole to ensure unobstructed air flow. ② Add the prepared electrolyte with a density of 1.285 (note that sulfuric acid should be slowly injected into distilled water when preparing the electrolyte), and add it to 10-15mm above the separator. ③ After adding the electrolyte, let the battery stand for 2-3 hours to connect the positive and negative terminals of the battery to the positive and negative terminals of the power supply, and prepare for discharge. ④ Preliminary charging shall be carried out according to the current and time specified in Table 2-59. Stage current charging increases the terminal voltage of each small battery to 2.4V, and then switches to second stage current charging until the voltage and electrolyte ratio no longer change significantly within 3 hours.