Even well-maintained gel batteries degrade. Look for these signs:
- Reduced Runtime: If capacity drops below 60%–70% of original, replacement is due.
- Slow Recharging: Takes much longer to reach full charge.
- High Self-Discharge: Loses charge rapidly when idle (more than 3%–5% per week).
- Physical Damage: Swelling, leaks, or terminal corrosion.
Testing Methods:
- Load Test: Apply a 50% load and check voltage stability.
- Capacity Test: Fully discharge at a controlled rate to measure Ah remaining.
Key Takeaway: Proactive testing prevents unexpected failures—replace batteries before they fail completely.
