QUOTE(eastwest @ Dec 7 2021, 09:41 AM)
meaning those samsung will charges to maximum 80% only?

i think its normal nowdays.my laptop also same. can charge up to 100%( but actually just 80% from designed capacity).
tesla car also same. their software limit just 80% charge unless u want to travel more longer so can charge up to 100%.
old phone, mybe they still dont have this feature yet. i also use accubattery to let me know if its charge to 80% and give me notification on my smart watch, so that i dont overcharge it.
same when i went to sleep, i set the smart plug charger , to turn it off once the battery around 90% full.
i only full charge it when i feel i need to use phone more longer.