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I noticed the opener in our nursery was making a similar beeping noise and asked them how often they replace the batteries and they said the noise was actually due to a problem, that they generally don't have to change the batteries very often. She did say something about only changing the batteries at midday but I imagine that's related to the automatic settings they have set up, which we don't. I was told that one of them had used the same batteries for years with no problem.