Thermal runaway in UPS batteries occurs when internal short circuits or overcharging cause temperatures to exceed 140°F, triggering a self-accelerating chain reaction that can result in fires, explosions, and toxic gas release. Prevention strategies include maintaining ambient temperatures below 77°F (each 15°F increase above this reduces battery life by 50%), implementing battery monitoring systems that detect individual cell failures, and following manufacturer charging profiles to prevent overcharging—particularly critical for sealed lead-acid and lithium-ion battery technologies.
Thermal runaway in UPS batteries poses a serious threat to any facility. Understanding what it is, how it begins, and how to prevent it is crucial for businesses that rely on UPS systems.
Thermal runaway occurs when a battery’s internal temperature rises rapidly. The heat can trigger chemical reactions that can spread across batteries and potentially cause fires or damage to equipment.
Unlike generators, which take time to start, a UPS delivers backup power instantly. Unfortunately, that convenience is one of the reasons routine checks are overlooked, but they can help prevent thermal runaway.
Knowing what causes thermal runaway in UPS batteries enables you to act in advance. Some triggers are:
Different UPS batteries respond differently under stress:
Regardless of the batteries you use, early detection is crucial to prevent further damage or full thermal runaway.
The following is a responsible list of actions for preventing thermal runaway in UPS batteries:
In addition, following IEEE 1635 and NFPA 855 ensures UPS installations meet strict battery management and fire-prevention standards. Facilities that comply reduce the risk of thermal runaway.
If you want to avoid a thermal event that could start fires and potentially put equipment or lives at risk, the safest course of action is to schedule a UPS inspection with a trusted provider. Request a quote from Nationwide Power today.
