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I have about 15 Aquara sensors in my house and had no real issues for the last ~3 years. Only real annoyance with the Aquara ones is that the battery opening mechanism has the worst piece of plastic I have ever seen. I still have not found a reliably way of opening those damn things without breaking the soft plastic. If anyone has found a way to do that I am all ears

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I can't open those with a coin, the plastic is too soft indeed. But if I stick them to another object using the included sticker I can just rotate the device itself to reach the battery. If you want it to be mobile you can stick it to something small or a 3d printed piece of plastic.

I also do the stick and twist method for opening them, but it always require new adhesive, so not a good solution. I also tried multiple 3d printed jigs for opening but those also didn't work very well

You need the right sized coin. A nickel works best. Anything else doesn't fit right and tears up the plastic or slips out.

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