"D Yuniskis" wrote in message
...
ian field wrote:
The damn thing has developed the habit of bleeping at random intervals, I
tried running it flat and then reconnecting the mains supply but it still
keeps bleeping.

The user manual doesn't have a trouble shooting table and apart from the
random bleeping, the UPS appears to be working correctly.

Any suggestions?

Put a switch in series with the noisemaker. I ran a UPS
with this symptom for years with the alarm disconnected.
AFAICT, the UPS always "did the right thing" (in terms
of power) so the noisemaker was just that -- a maker
of noise. :

My best guess would be the battery's internal resistance has started to
increase.

If it does give up, I have a 12V12Ah battery left over from a bigger UPS I
scrapped that used 2 batteries - one was dud and a new UPS from Maplin was
cheaper than replacing the battery.

It won't fit, so it looks like fly-leads through holes drilled in the case -
I can pull the wires off the sounder while I'm at it.