I loved the S8 until the early October 2019 android(?) update. As soon as the update was installed my phone would show 100% battery charge then within 30 minutes the phone would shut off. When I turned it on, it would show 0% battery but only take 10 minutes to charge to 100% again. After trying all the suggestions with no luck I did a factory reset. This did not help. Later in the month I received another update. I was hoping this would fix it but it did not. Any suggestions?
The problem isn't the battery, it's something with the way it determines the battery's life. I have been able to play music for two days without loosing power. Then, the next day I will turn off the music and within a few hours the phone will shut off. After charging to 100%, which sometimes takes 2 hours other times takes 20 minutes, it will turn off again after only a few hours with nothing running. Most of the time, just before it shuts down because of low battery, the battery indicator displays 100%.