1）Overcharging
Charging in long time, frequent full charging and failure to disconnect the power in time will cause the internal pressure of the battery to increase, the active material to expand, and form bulges.
2）Charger mismatch
Using non-original, inconsistent or inferior chargers will cause unstable charging current and voltage, which may lead to battery overcharging and swelling.
3）High temperature environment
When charging in hot seasons or under directly in sun, the internal temperature of the battery will rises, the pressure increases, and bulging occurs.
4）Battery quality problems
Inferior batteries or poor design and manufacturing processes may cause failure of internal plates, safety valves and other components, making bulging more likely to occur.
5）Safety valve or exhaust port failure
The safety valve pressure is too high or the exhaust port is blocked, the gas inside the battery cannot be released normally, and the pressure accumulates, causing bulging.
6）Improper charging habits
Improper charging timing (such as charging immediately after riding), charging for too long, frequent use of fast charging stations, and mixed use of chargers can easily cause battery swelling.
7）Physical damage
If the battery is subjected to external damage such as impact or squeezing, or its internal structure is damaged, it will also cause bulging. If find a bulging battery, stop using it immediately and replace it to avoid potential safety hazards.
