I'd replace the entire UPS and recommend a Powercom UPS. Their site is
www.powercom-usa.com They have one that runs for 70 minutes during an
outage. They're even cheaper if you order through Cyberguys.com
($179USD). Batterys need changing every 9 yrs. but this is easy.
Connects to a computer (RS232, aka Serialport) and includes
auto-shutdown software. Also great for keeping VCRs set. You may be
able to use it to watch a movie during an outage (find other source of
power for TV, deguass will burn out the transformer like what happened
here, TV may function improperly...)