Old post I know but still relevant to my current input and not worth starting a new thread:
Just replaced my UPS battery again, not bad service I suppose, close to 4 years for a lead acid cell.
Tried to revive the disconnected battery with a smart charger, did manage to get the voltage back up to normal but collapsed again with minimal loading, end of life.
Got what I thought to be a battery replacement good deal from "Duracell Direct", competitive price with free courier next day delivery by DHL, by no means normal to my off-shore location, courier delivery usually heavily loaded to N.I.
Battery life with this particular cell, very reputable make, time will tell?
UPS backup is probably more important to me now as on FTTP with a digital phone LL.
Before anyone comments, my ONT is PoE powered, Hub & digital phone also UPS fed.
No big deal I know virtually everyone having access to a mobile phone these days.
As per previous post, important to periodically test the UPS health, I only discovered this failure during a short power outage.