Try it and monitor the batteryI never did. First time doing it.
Wanted you to charge it first to 100 % then put in safe mode see the battery drain .So it seems to only stay in the 70's in safe mode. Without safe mode it goes up to 100% then when I unplug charger, it it starts to lose charge fast.
Safe mode is just diagnostic mode it turns off 3rd party apps , so you need to find which app is causing this battery drainWhen I charge my phone to 100 now, when i unplug charger it goes to 98. Before it would go all the way down to 67. I think the safe mode actually helped. Thanks.