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Those who are facing the battery backup issue .. Charge your device fully and don't switch off the charging untill it reaches 100% and even at 100% keep the charging on for 15 minutes.. this way your backup will increase.. And if this is not working for you please Download the latest package from updater app,Install and try this step. This worked for my Note 7 pro 4Gb Variant.. Currently I am getting around 7-8 hrs of SOT AND MY DEVICE IS 6 MONTHS OLD.
First Check for any application draining your battery or not. If this not able to solve the problem try to report your issue by sending it with log. Also there may be defective batteries or bug in the ROM, visit your nearest mi repair center and explain your issue.