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
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
They're much easier to use if you stick them to the wall using the included round sticker, then you can just twist the body of the sensor against the wall
