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Back-UPS CS: Runtime does not exceed 45 minutes

Published date: 25 June 2018


Why won't my Back-UPS CS run longer than 45mins with a low load connected?

Product Line:



BK350, BK500, BK500BLK BK350EI and BK500EI


Safety Runtime Limiter


The 120v and 230V International Back-UPS CS models BK350EI and BK500EI, that were made before January 1st 2004, have a max runtime limiting cap of 45 minutes. Anything made after that date will not have a runtime cap. Instead with out the shutdown software they will run until then have exhausted their battery.

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