It sounds like the batteries were damaged. With the sealed lead acid type battery that are in a UPS it is best to keep them fully charged as often as possible. When the batteries are discharged too low then sulfation builds up on the lead plates inside and they wont take a charge. If you need to find batteries go to:
http://www.batteryinternational.com/ups-batteries.html
Hold the reset button on UPS for 30secs while the power is turned on...
Then keep the UPS on charge for 16 hours with no load...
then check for the backup... while you shut down the computer you should not turn off the power supply to UPS...
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