Everyday I get to bed I leave the phone charging until 7am. I have a bixby routine which enables the 85% limit and disable it 30min after waking up so the battery isn’t staying at 100% all night.
The battery health is at 100% and the charging cycles count is at 170.
adb shell dumpsys battery(mSavedBatteryAsoc and the 3 first digit of mSavedBatteryUsage)
Device is pretty new and bought it on April. Is a S21 FE
If you open an app that shows amps going into the phone or put an amp meter between the power adapter and the phone to see what amps the phone is drawing as it charges. When the battery reaches 100% you can see that no power is going into the battery so it is not going to be damaged by being overcharged or by being held at 100% for an age.
So your charging strategy is good and way better than the people who charge to 85% and then moan about battery life.