My S8 battery works perfectly fine from 100% level to 50% and this will work for 1 day almost , but, the issue which i am facing now a days is , as my phn reaches 50% mark , it started to drained drastically either or if i make it idle like lock the screen it will automically shutsdown , when bootback it shows 0% ,
what to do , may be it's a software bug in 8.0 or battery ?
model is G950F
Have you tried resetting the App performance? If you go to Settings and tap apps. Tap More Settings where you see the three dot icon in the upper right corner. Tap Reset app preferences then restart your device.
Honestly if this doesn't work and you notice no change while the phone is in safe mode, then repairs would be recommended.
Every Samsung device I've ever had (phones and wearables) has always had poor battery life. Tries all the tips and solutions. Like other aspects of the phone but it has never lasted a full day. I had Microsoft phones until the got scared again and abandoned their customers and they always lasted all day and I hat Apple so Samsung is about it.