Anand PM , via OnePlus 5 , Dec 8, 2019 : I had a long meeting 2 days ago and my phone had a rough day which resulted in it going from a 90% charge to 0% in a few hours. It stayed in 0% for another 2 hours or something until I got home to plug it in. However, when I plugged it in, there was an unusual message that displayed before the phone started booting up. I couldn't read it properly since it was so quickly that the message was displayed. I'm sure it had the word battery in it though. Ever Since that incident, my phone battery is rapidly going from 95℅ to 15%. How can I fix this?