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.
Although it goes up and down a bit, the current from the batteries is about 20mA, which would tie in with the rate they get through them (2400mAh).
Do they all get through batteries at this rate or has something aged, causing them to increase their power consumption? The base stations run for weeks on a single set of batteries.
Ta.
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