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Forums » Prof-UIS General Discussion » Charging guide for sealed lead-acid batteries Collapse All
Subject Author Date
accord21 accord21 Apr 13, 2024 - 6:22 AM

Sealed lead-acid (SLA) batteries, also known as valve regulated lead-acid (VRLA) batteries, are rechargeable electrochemical energy storage devices. Its popularity lies in its ability to provide stable power supply in various applications, including automobiles, ships, UPS systems, etc. However, in order to maintain optimal performance, it is crucial to charge the SLA battery appropriately. In this article, we will delve into the details of charging sealed lead-acid batteries.

Before discussing the charging process, it is necessary to have a basic understanding of the structure and working mechanism of SLA batteries. A battery is composed of positive and negative plates immersed in an electrolyte solution, usually sulfuric acid. The electrode plate is made of lead or lead oxide, and the electrolyte plays a crucial role in the electrochemical reactions that occur during the charging and discharging process. The SLA battery adopts a sealed casing and an internal pressure regulating valve. This design ensures that the electrolyte will not leak, making it safer and more convenient to use compared to traditional lead-acid batteries. However, this also means that the battery cannot be easily maintained or topped with electrolyte.
The service life of UPS lead-acid batteries is a key indicator that is crucial for ensuring the stable operation of the UPS system. Generally speaking, the normal service life of UPS lead-acid batteries is around 3 to 5 years, but the specific service life is influenced by various factors such as usage environment, load situation, maintenance status, etc. To determine the service life of UPS lead-acid batteries, the appearance and performance of the batteries can be observed first. If the battery shows bulging, leakage, or deformation, it is usually a sign of battery aging and may be approaching its service life. In addition, the charging and discharging performance of batteries is also an important basis for determining their service life. If the charging speed of the battery slows down, the discharge time is shortened, or it is unable to maintain sufficient power, then this may also be a manifestation of battery aging. In addition to observing and testing the performance of the battery, you can also refer to the factory date and usage time of the battery. Generally speaking, as time goes by, the performance of batteries will gradually decline, so understanding the usage history of batteries can help to more accurately determine their remaining service life. Of course, to determine the service life of UPS lead-acid batteries, it is necessary to comprehensively consider multiple aspects such as the appearance, performance, and usage history of the battery. For batteries that are about to reach their service life, it is recommended to replace them in a timely manner to ensure the stable operation of the UPS system.
Charging process
Now, let’s delve deeper into the charging process. The main purpose of charging is to restore the capacity of the battery by reversing the electrochemical reactions that occur during the discharge process. The steps are as follows:
1. Check battery status: Before charging, check if there is any obvious damage or leakage to the battery. Meanwhile, check the battery voltage to ensure it is within an acceptable charging range. If the voltage is too low, it may indicate deeper discharge or potential issues with the battery.
2. Connect charger: Use a charger designed specifically for SLA batteries. Connect the positive lead of the charger to the positive pole of the battery, and the negative lead to the negative pole. Ensure that the connection is safe and reliable, without corrosion or debris.
3. Setting up chargers: Most modern SLA battery chargers have intelligent features that can automatically detect battery status and adjust charging parameters. However, it is best to consult the user manual of the charger and set it to a charging mode suitable for SLA batteries.
4. Charging process monitoring: It is crucial to closely monitor the battery temperature and voltage during the charging process. Overcharging can damage the battery and may lead to premature failure. Many modern chargers have an automatic shutdown function when the battery is fully charged, but it is still a good idea to pay attention to this process.
5. Check after charging: When the charger indicates that the battery is fully charged, disconnect the power and let the battery cool down for a few minutes. Then, check the battery for signs of overheating, leakage, or other issues. If everything is normal, the battery can be used.
Maintenance and precautions
1. In addition to proper charging, maintaining SLA batteries is also essential for extending their lifespan. Here are some suggestions to help you keep your battery in good condition:
2. Regularly clean the battery terminals and remove any corrosion or debris that may affect charging efficiency.
3. Avoid over discharging the battery, as over discharging can damage the electrode plate and shorten its service life.
4. Store the battery in a cool and dry place to prevent excessive heat from affecting battery performance.
5. Regularly check the electrolyte level of the battery, but it must be a maintenance free and rechargeable battery. For sealed batteries, this is unnecessary as their design is maintenance free.
UPS lead-acid batteries are mainly divided into two types: valve regulated sealed lead-acid batteries (VRLA) and open lead-acid batteries. VRLA batteries are more suitable for use in uninterruptible power systems due to their advantages such as easy maintenance and low leakage rates. Friends who don’t understand can also visit our battery knowledge blog to consult relevant battery information. We know that the design lifespan of lead-acid batteries is usually 5 to 10 years, but in actual use, it may not be enough or slightly exceed this lifespan. Proper battery management and maintenance can maximize the service life of lead-acid batteries. In addition to following the above steps, the following measures can also be taken: controlling temperature: maintaining a stable temperature in the battery storage environment, avoiding high and extreme low temperatures. Regular maintenance: Set up a regular inspection plan to ensure that the battery is in optimal working condition. Reasonable charging and discharging: Avoid the state of the battery being fully charged or excessively discharged for a long time. Replacement strategy: Develop a reasonable battery replacement plan to avoid system failures caused by battery aging.
The price of 12 volt sealed lead-acid batteries can vary greatly depending on the combination of various factors mentioned above. The general market price ranges from tens to hundreds of yuan, depending on the specific parameters of the battery. For example, smaller capacity 12 volt sealed lead-acid batteries (such as 7Ah or 9Ah) may be priced between tens of yuan and 100 yuan, while larger capacity batteries (such as 100Ah or more) may be priced in the hundreds or even thousands of yuan. Especially for products from imported or well-known domestic brands, due to their high reliability, their prices are usually above the average market price. Consumers should not only focus on price when making purchases, but also consider multiple aspects such as product quality, brand reputation, and after-sales service to ensure that they can purchase products with higher cost-effectiveness. It is recommended to conduct market research before purchasing, compare prices of products from different brands and capacities, and pay attention to opportunities to reduce costs such as promotional activities and coupons. At the same time, pay attention to reviewing the product specifications and usage instructions, selecting the appropriate capacity and size, and understanding the warranty policy and return terms.