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I have replaced my outdoor batteries (Energiser alkalines) once on my WH1081 (around 6 months ago), given that I started this thread in March 2008, that would give over 2 years from the outdoor batteries. At replacement, the outdoor unit was still running, I just elected to change the batteries as I was relocating the unit. The indoor batteries were changed at the same time, once again the unit was performing flawlessly. I should add that my indoor unit is permanently plugged in to a USB port on my PC, I haven't bothered to check to see what if any power the indoor unit receives when the PC is shut down, but it may be that it gets enough power from the USB on shutdown to not drain the batteries.
Just an added note, I covered any holes/gaps in the rainfall sensor with flywire mesh and have had no further problems from spiders.
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