The life of a battery bloc can vary dramatically especially when used in a UPS System , the manufacturer will always state the expected life of a battery bloc on the proviso that it has a pure dc float voltage applied to it and that the ambient temperature is restricted to 20 C. If these parameters are adhered to, one can expect to achieve the 5 years life from a 3 5 year design life battery or the 10 years of a 7 10 year design life battery bloc, omitting manufacturing failures.
Unfortunately we do not live in a perfect world and as a result there are limitations applied to the battery bloc, one is the ambient temperature, although a number of rack-mounted UPS systems may luxuriate in ambient temperatures of 20 C or less because of the demands of the IT equipment, due to the nature of the design of the UPS there is generally insufficient space to achieve a significant airflow round the battery blocs and as a result they will fail the UPS system battery test after a mere 2 3 years.
In this situation the requirements of Uninterruptible power supplies and their installation mean that UPS maintenance is unlikely to detect the failure of the battery pack, often...
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