Batteries are overcharged
Warning
Batteries that are being overcharged are very dangerous! There is a risk of battery explosion, fire or acid leakage. Do not smoke, create sparks or have open flames in the same room as where the batteries are located.
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Overcharging batteries will cause battery damage and can be caused by:
Incorrect charge voltage settings.
Applying equalization while the battery is not suitable for equalization.
High current and undersized batteries.
Battery faults.
Too high current, while the battery is not accepting charge anymore because of aging or prior mistreatment.