@therob Thanks for your answer.
I just tried to do a battery software reset. and as you say, and it seems pretty legit to do that.
I am impress that you caan hold for 3 4 days. But I think I use a good bunch af battery intensive apps.so that may explain the difference.
Anyway, I’ll do other battery reste in the future, at least up till my battery’s average drop under a day.
I also have another problem, my clock battery must be dead. So that’s annoying. but unless it has other consequences than just having a clock that resets when I take off the battery, I won’t send my phone for repair I think. Because apparently for this kind of issue you have to change the whole motherboard. and apparenttly it’s not bothering me enough to justify this big a repair.