Sealed Lead Acid Battery

Sealed Lead Acid Battery is a common and widely used type of battery in various applications. While they are reliable and cost-effective, they can experience some failures during long-term use. In this article, we will discuss common lead-acid battery failures and provide corresponding solutions.

1. Sealed lead acid battery unable to charge or low charging efficiency:

Failure causes:
a. Poor terminal connections or corrosion.
b. Charger malfunction or incorrect output voltage.
c. Formation of sulfates inside the battery, reducing the electrode surface area.

a. Clean and inspect the battery terminals, ensuring good contact, and use anti-corrosion agents to protect the terminals.
b. Check the charger and ensure it is functioning properly. Use an appropriate charger that provides the output voltage as specified by the manufacturer.
c. Perform equalization or balanced charging to dissolve sulfates. If the issue persists, the battery may need to be replaced.

2. Excessive self-discharge rate:

Failure causes:
a. Battery aging or reaching the end of its lifespan.
b. Battery stored in high-temperature environments.
c. Internal short circuit in the battery.

a. If the sealed lead acid battery is aging, it can only be replaced with a new one.
b. Avoid prolonged exposure of the battery to high-temperature environments. Store the battery in a cool and dry place.
c. If there is suspicion of an internal short circuit in the battery, it should be taken to a professional repair center for inspection and repair.

3. Decreased battery capacity or reduced runtime:

Failure causes:
a. Over-discharging or overcharging the sealed lead acid battery.
b. Battery reaching the end of its useful life and needing replacement.
c. Damage to the active material inside the battery.

a. Avoid over-discharging or overcharging the sealed lead acid battery and use chargers for proper management and maintenance.
b. If the battery has been in use for a long time and the capacity has significantly decreased, it may need to be replaced with a new battery.
c. There are no effective repair methods for damaged active material. In such cases, replacing the battery is the best option.

4. Leakage or swelling inside the sealed lead acid battery:

Failure causes:
a. Damage to the battery’s casing or seal.
b. Excessive charging current.
c. Battery usage in high-temperature environments.


a. Inspect the battery casing and seal, and if there is any damage, the battery should be replaced.
b. Ensure the use of an appropriate charger and follow the manufacturer’s recommendations and guidelines.
c. Avoid exposing the battery to high-temperature environments and store it within the appropriate temperature range.

Please note that for maintenance and troubleshooting of sealed lead acid battery, it is advisable to consult the manufacturer’s manual and guidelines. If you are unsure about diagnosing and resolving battery failures, it is best to seek assistance from professional battery repair services or technicians.

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