Hi,
My PC UPS (Zebronics – ZEB U725) is not giving backup when there is a power failure. It is 2.5 years old. To check it, I opened it and tested the voltages.
The battery is a 12 V, 7.0 AH sealed Lead Acid battery. The ratings of the battery are:
For cycle use: 14.6-14.8 V
For standby use: 13.7-13.9 V
The battery voltage (under open condition) is 13.39 V. The charging voltage from the UPS (under no battery connected condition) is 13.43 -13.45 V. As per the article
here, the output of the battery seems to be OK for standby use but not for cycle or backup use. Pls. correct me if my interpretation is incorrect.
I wanted to ask the following:
** Which do you think has gone bad – the battery or the UPS?
** If the UPS circuitry has gone bad, how to check it?
** How to ascertain if the battery has gone bad?
Any pointers will be thankfully acknowledged.
Regards,
Arvind Gupta