Mohtaram Asif Sahib,
When checking your system, you always check the health of the battery first. This is how to check your battery. Take your battery to any battery dealer and ask him to put it on charging mode for 24 hours. When he is done with the charging, ask him to check it through his load meter. The health of the battery can always be checked after it is fully charged.
If one of your cells is bad, don't go for getting the battery repaired but buy a new one and always go for AGS, it is the best.
Is there any way you can return your Homage UPS? If you can then get it done because it is of poor quality. No offence please.
Regards.