I just bought an 8th generation iPad from the T-Mobile store by me Wednesday night. I charged it Wednesday night when I went to bed when it was around 50%, and used it all day yesterday for work, and since it still had 68% I did not charge it. Been using it since 7 am and it still has 55% remaining, have to say the battery life is amazing.... the question is for its second charge, when should I charge it again, at 20% or less in order to continue getting maximum life and time out of the battery? Also, I had the store agent install a Zagg glass screen protector on it, what is the best way to clean fingerprints from it, want to keep it nice since it is the first new iPad I ever purchased, I have bought used ones before, but this one like my MacBook Air and iPhone XR is my baby.