I m using redmi note 4 since four month and I found battery issue in it.
It take minimum 4 hours to full charge.
& Sometimes its take exra time .it is very bad thing in this smartphone another thing is it’s have fingerprint sensor’s problem when I put my finger on fingerprint sensor it take minimum 2 sec. To unlock device while MI show us that device take 0.5 sec. To unlock with fingerprint .Thats it