My phone deducts 10% at night eventhough I am not using it. Is it normal?
If the phone is left turned On then background processes and updating, apps working in the background as well as signal connection will use battery.
Some apps can be put to sleep.
Your Battery Stats section should help to highlight whats using the Battery too @Cchy
Phones that have Always On Display will use a little more battery.
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Current Phone ~Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+ Samsung One Ui 3.1/ Android 11.