In article ,
Yuki writes:

Agree, my experience is 3 to 4 years per set in non air conditioned places (not
zero capacity, they fail the autotest, annoying alarm) although the UPS in cold
server rooms go over 6 years for a set of batteries.

Actually my experience of the short life was in an air
conditioned server room, but we had another one on a
different site which was in a non-aircon'ed office,
and that had the same issue.

--
Andrew Gabriel