Why do batteries require replacement?

Battery failures are the main cause of a UPS failure. Of causing significant disruption to your load in the event of a power cut.

You might well ask why do batteries require replacing?

Most UPS systems use lead acid batteries (and in particular VRLA) of which the single most common cause of premature failure is temperature. The optimum performance temperature (and the one that manufacturers use when stating the batteries life expectancy) is 20 ºC plus or minus a degree.

The general rule of thumb is that the battery life is halved for every 10°C above 25°C.

High battery temperatures causes;

  • The ambient temperature of the environment
  • The heat which is generated by the batteries themselves.

When discharging, batteries absorb heat. As batteries charge, they give off heat at the rate of around 0.02 Watts per Ah per 12V DC. It’s therefore important to ensure that the cooling system maintains optimum battery temperatures. Its also important that there is sufficient space around the battery blocks to allow ventilation.

A second major contributory factor to reduced battery life is the number of battery discharge-recharge cycles. The amount of energy that a battery delivers during a discharge directly impacts on the life of the battery.


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