On Sun, Jun 14, 2026 at 12:42 PM Eben King <[email protected]> wrote: > > On 6/14/26 10:07, John Hasler wrote: > > Before you replace it open it up and reseat and retighten all the > > connections (especially the battery terminals). > > Did that. I disconnected them all, checked the battery voltages (13.4 > and something else reasonable), and checked the 60A fuse between them. > It's a weird fault, that it goes instantly from completely normal to bad.
I don't think it goes from normal to bad. The smart UPSes estimate battery health or life and then shutdown after annoying you with beeping. I usually encounter it after replacing a bad battery with a new one. The UPS acts as if the old battery is still installed. Maybe reset the battery health or calibration that estimates health? Use something like upsrw from <https://networkupstools.org/>. Or search for "ups reset battery calibration linux". Jeff
