Most battery failures are not manufacturing defects — they are the result of preventable conditions. Understanding why batteries die is the first step to maximizing their lifespan.
Top 6 Causes of Battery Failure
- Sulfation (most common): Lead sulfate crystals harden on the plates when battery is left partially charged. Reduces capacity permanently. Prevention: Always keep batteries fully charged.
- Grid corrosion (heat killer): High temperature accelerates positive grid corrosion. Prevention: Keep batteries cool. Every 10C above 25C halves life.
- Water loss (flooded batteries): Electrolyte levels drop below plate tops. Causes permanent damage. Prevention: Monthly water checks.
- Stratification (flooded batteries): Acid concentration increases at bottom of cell. Causes uneven discharge. Prevention: Monthly equalization charges.
- Deep discharge damage: Repeated discharge below 10.5V (12V system) destroys plates. Prevention: Set inverter low-voltage cutoff correctly.
- Thermal runaway: Charging causes heating, which accelerates charging, causing more heating. Can cause fire. Prevention: Temperature-compensated charging, ventilation.
Warning Signs of Impending Failure
- Capacity drops significantly (noticeably shorter runtime)
- Individual cells taking significantly different voltages
- Battery case swelling or deformation
- Excessive gassing during float charge
- Terminal corrosion and heat buildup
- Resting voltage of one battery notably lower than others
How to Test Battery Health
- Resting voltage test: Measure after 1 hour rest. All batteries in bank should be within 0.1V of each other.
- Load test: Discharge at C20 rate for 20 hours. Measure actual capacity vs rated.
- Internal resistance test: Use a battery analyzer. High or uneven resistance indicates degradation.
CHISEN Battery — 8 factories, 70M kVAh/year. OPzV/OPzS 100-3000Ah. Tel: +86 131 2666 8999 | jack@chisen.cn | www.chisen.cn