Battery drain

[Leong99]

I am using S21 Ultra 5G. I have been encountering battery drain about 6% to 8% at night. I charged my phone till 85% (to protect the battery) at night. When I woke up the battery showed 77%. I did not use the phone whole night but the battery % dropped so much. Since I upgraded to Android 12 and charge the battery to 85%. The battery won't last me a day. Another issue I also observed that the battery % will drop after I disconnect from the charger after a few minutes even though I did not use the phone.

[JVT_Jeff_Viral_Tech · Accepted solution]

Hi, S21 Ultra user here... Been using Android 12 update Day 1 it's available in Singapore 🇸🇬

1. Regarding dropping of battery 🔋, Did u use AOD which is Always On Display?! If yes, 2% drop per hour is normal if u never use your phone.

2. Battery 🔋% drop after u disconnected from charger is normal for Samsung phone.

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[bluezombiehead]

Quite normal. My S20FE 5G also battery drain 6 to 8% per night, and is very annoying. I hope Samsung do something to this.

[HustleEveryday]

Some apps can also add on to this issue. Disable them if not using. I'm also experiencing same problem. Using of dark theme helps a little bit. Yes AOD does eat in quite an amt of battery life also. Too much of fast charge increases battery % drops also. I'm using S21 Ultra...

[Leong99]

Does fast charging damaging to battery?

[HustleEveryday]

My answer is yes but u won't feel / sense or notice it nw or near future but long run you'll sense that the battery is drainning faster than nw and u will have to charge more times as fast charging don't reali charge the battery to 100% in actual fact even thou u see that it's already charge full 100% cause battery cell is actual only maybe like 85 to 90% full. Long run battery life span not lasting. If u r not in a rush then use normal charging as and when using fast charging is ok no harm. If yr phone battery left maybe like 20 to 25% u can start charge already using normal charging.

[PapaJohns]

Hold volume down and power at the same time until it reboot and you see the Samsung logo. 2. Back up your data and factory reset. 3. Wait a couple hours/days longer the better. If all fails please go to a Samsung experience store or any Authorized service center.

How to backup and restore data: https://www.samsung.com/uk/support/mobile-devices/backing-up-and-restoring-data-on-my-galaxy/