Which of the following is NOT listed as a common cause of battery failures in ESS?

• A. Thermal abuse
• B. Humidity control
• C. Improper charging voltage
• D. Frequent maintenance

Answer: (B)

When battery failures in an energy storage system happen, they’re usually driven by conditions that directly stress the cells. Overheating, or thermal abuse, pushes temperatures beyond what the chemistry can safely handle and can lead to accelerated degradation or even thermal runaway. Charging the battery outside its designed voltage range, i.e., improper charging voltage, causes chemical imbalances, gas buildup, and capacity loss.

Humidity control, on the other hand, is a preventative measure to keep moisture out and protect against corrosion and moisture-related faults. It’s not a direct mechanism that causes a battery to fail. That’s why this option is the one that isn’t listed as a common cause.