>> Sorry to resurrect a slightly old thread but I have two of these things, about
>> three and five years old respectively and both from Lidl.
>>
>> The two external sensors are of different types, the older one runs on two AA,
>> the newer on two AAA batteries and is a bit smaller. Both of them eat
>> their batteries in four to five days, whether rechargeable or alkaline.
Nope they should both last about a year on good batteries.. I would guess yours have water ingress causing current drain
dry them out and try again.
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