UPS battery life is often as high as 5 years if the batteries are the gel type and the UPS is a good quality unit which uses some intelligence to manage the charging of the batteries. Cheaper batteriesand UPS's do result in shorter battery life... I know because one of our office UPS's was a Makro cheapie and they lasted less than 3 years.
The price difference in UPS's of similar KVA ratings is very much relative to the type of UPS and the quality of power protection it offers.
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