_rofe_sor-X_ Even if the battery is rated at 5000 mah the typical or real mAh can vary {- +} 50 - 200 mAh. Don’t worry it is just an app problem.
Querry 2 - Once your phone learns your use pattern it will give the best possible backup, which will take 4 - 7 days, use your phone normally and it will adapt to your usage.