I have or had 2. The older 550VA model is still going strong and is probably over 10 years old. I change the battery when one of our frequent power outages lets my system shut down before the power comes back on. Cheap monitoring system I have. HAHA, power just went out as I am typing this but cyberpower saved the day. coinkydink but this is my main need for a UPS, not long run times.
The more expensive tower I bought after the one above gave up the ghost after only one battery change so about 4 years. Started getting very warm and no BU power so I ditched it.