The batteries in my Honeywell Vision Pro 8000 are weak and the low battery
warning is flashing. When I change them (3-AAA), will I lose all the
programming, or only the date & time ??? The manual states nothing about this.
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They use specialized time keeping chips in these things that have a memory
storage and their own backup battery (good for at least 10 years). I don't
know specifics of the Honeywell Vision Pro 8000 t-stat internal circuitry
but the manual does say "real-time clock" which, incidentally, "keeps time
during power failures ..." and that usually means a real-time chip like
the Dallas DS1287, which is a self-contained part with its own battery
onboard is used.
So, go ahead and change it. As gregz pointed out in an earlier reply, your
choices are rather limited anyway. But I think you will be just fine.
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