One of the most common causes of premature failure in 12V gel batteries is overcharging. Unlike AGM or flooded batteries, gel batteries are highly sensitive to excessive voltage, which causes:
- Gel electrolyte drying out due to excessive gassing.
- Thermal runaway, where heat buildup accelerates degradation.
- Premature capacity loss as the battery struggles to hold a charge.
Preventive Measures:
- Use a gel-compatible charger with a voltage limit of 14.1V–14.4V (absorption) and 13.8V (float).
- Avoid cheap PWM solar controllers—opt for MPPT with gel battery presets.
- Monitor temperature and use a temperature-compensated charger in hot climates.
Key Takeaway: Overcharging is irreversible—invest in the right charging equipment.
