On 6/14/26 12:39, Robert Heller wrote:
At Sun, 14 Jun 2026 10:13:32 -0400 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.
Does it still work as a "dumb" UPS?
I unplugged the USB connection to the computer, rebooted the UPS, and it
persists on denying the existence of its batteries. Every few minutes I
hear a relay click and it toggles between 100% charge and no batteries
installed. I suspect some component is periodically overheating, but
without a thermal camera good luck finding it. Heck if I'm going to to
feel around on a PCB that uses 120VAC.
If an outage happens when it thinks it has batteries, it _might_ do its
job, but I wouldn't count on it. A replacement has been ordered, ETA
later this week. This time I ordered a surge suppressor too, because
that's how I think this one died. I live near Tampa.fl.us; lotsa
lightning here.
