When to replace UPS batteries?

The most common type of UPS batteries are VRLA batteries.
So when is the best time to replace UPS Batteries?

Standard 5 or 10 year design life. It is difficult to accurately predict when to replace UPS batteries.
Every system is subjected to particular characteristics (e.g. system temperature, ripple current, number and depth of discharge).

However, as rule of thumb, to ensure that the batteries do not fail when you need them, we advise:

  • 5 year design life: replace in year 3
  • 10 year design life: replace in year 6/7

Carrying out a battery impedance test will give you an indication as to how the battery blocks are performing and identify if they do need replacing.
It is also important to maintain the batteries at a constant 20 to 22 degrees Celsius.
You won’t affect the life span too much if it is a degree or two above or below.
But you will notice a considerable deterioration if the room temperature is significantly different to the ambient for continuous periods.
Regularly carry out a battery impedance test or at least once a year as minimum.
If any battery  falls the battery impedance test then look at replacing the failed UPS battery/batteries ASAP.

UPS battery replacement

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