after clearing catche it is slightly improved, now it is lasting for 15 -16hrs, still earlier was much better, may be I can try last option reset to factory dedault n check.
me too facing same issue with my gear s3. it shows battery less than 15% in just 7 hrs after last update. it gets off when having 10% still sometimes. then if you keep for charging it shows immediate 50%. then charges slowly to become 100%. no idea w...
