Had another UPS battery for my server rack bite the dust. Down to 2x 80ah @ 12v now. I did not test it but I suspect it failed like all the others of same model that failed in the past. Shorted cell. I was doing basic maintenance the other day and noticed it was warm so disconnected it and tested voltage, it was actually fine for a day or two and now today it dropped to around 10. It was from 2015 so a half decent run for a cheap Canadian Tire battery. It seems to be a defect in that model, and to avoid mixing battery models I was always replacing with same ones.
It's a work in process to replace that entire setup, so I have not been adding more batteries when I get one that dies. I actually have the UPS plugged in a -48v inverter which has a small temporary battery bank and also a transfer switch to transfer to solar, so basically outages now involve zero blip for the entire server rack, including my workstations, and even my home entertainment setup, as all of that is on inverter now. Ideally by end of summer I'll have done all the proper DC wiring, battery boxes, hydrogen venting etc and then I'll be ready to add the big batteries. That will give me around 12h of run time at full load, and more if I shut non server stuff down, which I would, during an outage.
At some point I want to actually start upgrading some of my server/network gear. Been focusing more on the infrastructure itself in these past years and I'm itching to play with new tech such as Proxmox and Ceph.