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Original topic:

S21 Overnight Battery Drain

(Topic created on: 08-07-2021 06:51 PM)
mmtech
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Galaxy S21 Series

I have seen battery drain overnight in S21 even if you have restricted everything still 10-15% battery drains in 8 hours. When checked in Battery & Device care it shows

Google Play Store : 0.7%

Gmail: 0.2%

one UI: 0.2%

This total is around 1% then where remaining battery goes ?

This is really weird, is there a way to find out what else is draining battery taking 14% battery overnight?

Also i kept phone in Safe Mode overnight just to be sure no hidden third party app drains battery but result is still the same 12% battery drain.

I have been pixel and iphone user in past but never seen more than 5% battery drain overnight. Is battery used is cheap quality or poor wiring.

Any one else facing it ?

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29 REPLIES 29
Pugs1957
Superuser I
Superuser I
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Galaxy S21 Series
A poor signal can drain battery, try airplane mode overnight.
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GoanGeek
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Galaxy S21 Series
Use Bedtime mode in digital wellbeing app.
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mmtech
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Galaxy S21 Series

Only samsung phones cannot handle poor signal. surprising. Will try Airplane mode and message here the output.

In Google Pixel there is Network Standby battery drain percentage. How to see that in Samsung?

And How much is your Battery drain overnight?

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mmtech
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Galaxy S21 Series

Tried Bedtime Mode same result.

Also tried power saving mode including restricting background data still same % of battery drain.

How much % drain is for you overnight ? 

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Pugs1957
Superuser I
Superuser I
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Galaxy S21 Series
No more than 5%. I usually have music playing quietly. Older S series phones had a standby graph but not any more which is a shame. I do get 2 days usage on a charge.
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mmtech
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Galaxy S21 Series

That's Great. Any suggestions so that battery drain is less than 5% overnight. Other than turning on Airplane mode.

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Fiona26
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Galaxy S21 Series
Mines is pretty good battery to be honest. Doesn't drain much in standby, I followed these battery saving tips on you tube. This is all I've done myself.
https://youtu.be/fxT-9DKytlw
Also check out bixby routines. You can set your phone up for a scheduled time. Turn off location and turn on battery saving mode at bed time while not using the phone. Very handy. Check it out it may help.
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Fiona26
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Galaxy S21 Series
https://youtu.be/UFwdiYwm6w4
Handy video to let you get the idea of using bixby routines.
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mmtech
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Galaxy S21 Series
I have tried all these steps already before posting here.Also watched video multiple times to make sure I enabled all required steps. Still the battery drains 1.5%/hr which is around 12% when phone not in use overnight.