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ITFrequently Asked Questions · UPS
What is the average lifespan of UPS batteries?
It depends on use and temperature. Lead-acid (VRLA) batteries usually last 3–5 years at around 20–25°C. Every 8–10°C above 25°C roughly halves their life, while cold mainly reduces runtime. Check the batteries regularly and replace them when the runtime drops noticeably.
The VRLA lead-acid batteries used in UPS units typically have a practical service life of 3–5 years. Where you land in that range depends mainly on room temperature, on how often deep discharges occur and on the quality of charging.
Heat is the most important factor. As a general rule, for roughly every 8–10°C above 25°C, the expected battery life is about halved. A battery that would last five years in an air-conditioned room may need replacing after two to three years in a storeroom that heats up in summer. Cold, by contrast, does not wear it out in the same way, but temporarily reduces runtime.
Signs of ageing are noticeably shorter runtime, a replace-battery warning during the automatic self-test, or a swollen case. In critical applications many people schedule preventive replacement at 3 years, while in mild conditions batteries can last longer.
Tip: always replace all the batteries in a string together, with the same type and capacity. A new battery next to old ones wears out quickly and does not perform.