This phone has a media server app that takes almost 70% of your battery . This app cannot be force stopped(this app is used to scan all media files and refresh in your gallery). So if you charge your phone 100% it will be 65% in jus half and hour even on standby because of this app. And the back panel of phone heats so much that its is very useful during winter to keep you warm:P. Trust me my pant gets warm as soon I slide my phone in pocket in jus 3 minutes.Mounting External SD card will make the media server app go worse . So solution is dont add any files on your phone to keep media server quite and get high battery life.
2 The apps cannot be moved to memory card so you have to use the only 11 gb space available in phone for apps(half will be consumed by whats app:P) . and don even think of rooting the phone, if you root by seeing the you tube videos(MOST ARE ONLY FOR REDMI PRIME /REDMI NOTE 4G) .If u root it any ways you wont get any updates to install.
3 there is no search option in music player provided in phone, so if u like that one song among 700 songs you have to scroll way down to get that one song to listen.So if you install any other music app which has search option, it will only scan your internal storage songs not external storage songs.
I have reported all these bugs to xiaomi, still no action taken .oooops I forgot why will they take any action . I already got scammed with 8500 rs by them:P