His only solution was to flash the ROM clean from fastboot. One of my friends with the Note 4 SD had the same issue just a few days ago. Power saving is a very essential feature when it comes to battery draining issues.
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The battery is draining fast again and I saw that this is a recurring subject that many people have the overheating and draining. I am using Redmi Note 4 with MIUI 10 and I am facing the battery draining issueI have gone over many threads saying the draining issue is due to Google Duo and other Google apps I had uninstalled many of them including duo chrome Google app and also turned off the play protect but still my phones battery draining too fast with in 3 - 4 Hours and Phone keeps Heating while WIFI or Mobile. In most of the cases fast battery drain occurred because of background apps problem. Find the third-party app thats draining your battery.