@ai6yr @W6KME I have an Eaton UPS. When the two lead acid batteries died and started swelling I removed them and replaced them with two LiFePO4 batteries that actually have more amp hours than the originals. It worked well through multiple outages and the only caveat I discovered was in the last outage it completely drained the batteries to a point where I needed to remove them and revive them with a charger. You can't do that with lead acid.It is worth considering.
