I hoped this week's update would correct but not, the problem I experience since 21.4.14/15. I have a strange unexplainable drop of battery life on my MI 9SE during night when phone is switched off. My phone is set to off between 23:30 and 6:30 to save the battery life and not to be disturbed. The battery level dropped by ~20% upon switch on at 6:30. Until 21.4.7/8 everything was working normally there was no such phenomenon.
Has anybody experienced similar, can anybody explain it, propose a solution?
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From what I see in the graph it seems like its far from off. How can it be off and connect to a cellular network and to google play services? Check at what time the screen is on. A few senarios (it may also be a combination of them):
1)The power off schedule is glitched and doesnt turn the device off.
2)You have set the device to try to connect to 2g or 3g network instead of 4g. This may seem to save power, but if the signal it recieves is too low, it may waste more power while connected to the network.
3)The phone reboots itself for some reason during night.
4)The graph has an issue. Look, it consumed about 20% and around 10% was the cellular network, which says it was around 9mah. So, if 10% translates to 9mah then your phone has a battery of about 90mah, which seems impossible

. Check the battery with another app too, like
gsm battery monitor.