Unfortunately it is so intended, when you close the cover, and they are not switched off, respectively, by charging 3-4-5 days to zero.
To completely turn off their need to hold the button for 30 seconds as in the reset diode goes out and as long as you do not open the lid of the case, they will be switched off.
It's not exactly, I could be wrong. Almost 3 months ears, listen to every day. I sleep in them)))