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Cell Standby/Android System/Google Play Services battery drain for Oreo on S7

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Explorer

Hi, 

 

I really like my S7 Edge. However as a direct result of installing the Oreo update I have significant battery drain. The drain is attributable to cell standby which sometimes reaches over 50% of battery use. It definitely did not do this on Nougat, ever. 

 

I have not added any apps to cause this problem and would really like a suggestion about what to do. I can't believe Safe Mode will have any effect as this has happened as a result of the upgrade, not rogue apps. I am not keen to do a factory reset either as I can't see the benefit. I have cleared the cache, removed some apps, restarted etc, turned off any battery hungry options in settings but to no avail.

 

If anybody could help me I would be very grateful. I believe it is a bug in Oreo or Samsung's altered version of Oreo but cannot prove either. I can't think what to do apart from find out how to downgrade back to Nougat, which I don't want to do.

 

Many thanks.

 

739 REPLIES 739
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Observer

Cell standby drain is huge on my S7 flat with latest official Oreo updates. 

 

Screenshot_20180630-171823_Settings.jpg

 

See screenshot attached.

 

Samsung, please fix.

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No mate się is scrap everyday I try switch off this this nothing help....battery I scrap.... I must buy Powerbank 20000mah from 6 am to 11 am battery from 100 to 30 so Samsung pissoff for all customers not good
....
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*deleted*

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@mite_jan wrote:
Open odin 3 flash modem and bootloader only , 5 minutes

Why should BT (bootloader) be flashed along with CP (modem/radio module)? Is it enough to flash CP only?
Do these manipulations affect the "cell standby battery drain"? Can anyone confirm that flashing modem from newer ROM fixes the issue?

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@SmashMix that might work too
i have flashed them both and adios battery drain

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@mite_jan wrote:

@SmashMix that might work too
i have flashed them both and adios battery drain


I have flashed both BL and CP also. Now I'm charging the phone and will test is the issue gone or not.

its gone or not?
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@Nimkat-77 wrote:
its gone or not?

I can't say anything yet. Few days of normal use needed to make any conclusions.

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@SmashMix wrote:

@mite_jan wrote:

@SmashMix that might work too
i have flashed them both and adios battery drain


I have flashed both BL and CP also. Now I'm charging the phone and will test is the issue gone or not.


I decided to flash original ERE8 (Nordic countries (NEE); G935FXXU2ERE8) bootloader (BL) and left EREO (G935FXXU2EREO) modem (CP) for tests. With BL from ERF4 (G935FXXU2ERF4; same ROM as where EREO modem is) Samsung Pass, Pay and Health applications were complaining about "custom OS" and saying that phone was supposedly customized and has SuperSU rights (gentle hint like I have rooted device which is not a true).

 

Will see if only EREO modem will fix that cell standby issue. I will report the results after few days.

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@SmashMix you can see that the cell standby increases very slowly now 1h maybe 5mah
before it was draining a lot

so are you now on older ere8 bootloader but newer modem ereo?

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