hello bro, 17.4.1 does have some battery performance issues as per our users reported. But main reason being the instagram, facebook apps. overall your battery health management is good for 6 months 3% reduce.
if there is defect you will see fast reduce of health bro. within 1 year we will see it reduced to 80%.
so dont worry. simply follow charging practice as suggested.
- use original or mfi cable always.
- charge when the phone reaches 20%. thats all enough.
drain issue will be improved in upcoming updates bro. dont worry.