How long does a UPS last?

[JoeH]

On the other hand, I have seen batteries in APC units go in less than 3 years. And those APC units were in an air conditioned computer room with conditioned power so the UPS was rarely called upon to run attached equipment. In one 2200 VA unit the batteries had swollen enough to require dismantling the UPS to get them out, they would not slide out of the battery bay.