My Samsung  s9 battery  performance is very poor since one ui beta program and in stable verson same happening , from 20 to 0 percentage  within 2-3 minutes , iam frustrated   , i used all the steps to save battery but nothing  working

When my battery comes close to 20 % then within 2 minutes it goes down to 2 then switched off,  please solve this

Give a option to automatic switch on at prescribed time for a smartphone like in honor and mi phones 

Network speed display must be added