Did they always use batteries at that rate?
I've recently recently replaced one I've had for yonks where the outdoor sender went u/s. Cannot remember the make but it came from Maplin. Lithium batteries usually lasted several months.
Current one is Watson W-8681 MK2. Been in place for about eight weeks and seems fine except it seems to be wrongly calibrated. It includes a wind direction indicator and there's an align west arrow on the sender. Unfortunately it seems to be 180 degrees out. Easier to turn it than re-pack, return etc. IIRC the batteries are said to last months; there's a warning when they go low.
Would cleaning the battery contacts help (I suspect that's the problem with the Maplin one).
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