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

[James0071]

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.

[Sylva1n]

I got an OTA update yesterday (340mb- erg2) on my S7 flat, and although it's too early to tell, the battery drain looks better on 4G.

I've noticed using gsam that before this OTA update, under the application details, kernel (android OS) and android system were consuming around 35% of the battery used by apps. Now it's down to 13%.

The global battery consumption looks more balanced between the screen and the app usage. I'll keep you updated.

[VSiam]

With ERG2 modem and LTE:
first night (8h) - 2% discharge (as it should be)
second night - 18%
So, no magic bullet for me yet. (

[Sylva1n]

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@VSiam wrote:
With ERG2 modem and LTE:
first night (8h) - 2% discharge (as it should be)
second night - 18%
So, no magic bullet for me yet. (

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@Anonymous User phone has been on 4g for 20 hours, as well as 2*8 hours of airplane mode. With SOT @ 2h20, I'm left with around 25% this morning. It feels better, previously I would never reach the second night.

However for some reason, while in airplane mode, battery decreased by 6% last night, which seems quite high (1/2% previously).

[Xsever]

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 wrote:

However for some reason, while in airplane mode, battery decreased by 6% last night, which seems quite high (1/2% previously).

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I'm running the latest ERG2 modem on my S7 flat and last night I put the phone in airplane mode for 5 hours and slept and when I woke up, battery drain was 0%.

[Sylva1n]

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@Xsever wrote:I'm running the latest ERG2 modem on my S7 flat and last night I put the phone in airplane mode for 5 hours and slept and when I woke up, battery drain was 0%.

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Yeah, I've wiped the cache today, I'll see tomorrow morning. Might be just temporary.

[dj1891]

Noticing my phone's slower now with this new update, stutters and glitching.

[dj1891]

Ok so after 2 days of use I have noticed a couple of things.  The cell standby drain has gone, I've gone all day on 4g and Cell Standby is 2%. All stats are more balanced, ranging from 6% device idle to 1% for Gmail.  However battery life for me is no better.  At this stage of the day, just home from work I should be over 50% battery.  I'm now at 43% with same usage.  I also mentioned above I've noticed quite a few slowdowns and stutters which wasn't there before and yes I factory reset and cleared the cache when I first installed.  

[Xsever]

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@dj1891 wrote:

Ok so after 2 days of use I have noticed a couple of things.  The cell standby drain has gone, I've gone all day on 4g and Cell Standby is 2%. All stats are more balanced, ranging from 6% device idle to 1% for Gmail.  However battery life for me is no better.  At this stage of the day, just home from work I should be over 50% battery.  I'm now at 43% with same usage.  I also mentioned above I've noticed quite a few slowdowns and stutters which wasn't there before and yes I factory reset and cleared the cache when I first installed.  

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Sad to hear that. My experience with Oreo has been nothing but positive. Phone is smoother and faster and battery life improved in idle and in use. 

Mind you I'm using a stock-based ROM called DevBase from xda with the latest kernel (3.18.91) and the phone is now running the latest bootloader ERG7 and modem ERG2.

What kernel version is listed in your software information under about phone? 

[dj1891]

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@Xsever wrote:

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@dj1891 wrote:

Ok so after 2 days of use I have noticed a couple of things.  The cell standby drain has gone, I've gone all day on 4g and Cell Standby is 2%. All stats are more balanced, ranging from 6% device idle to 1% for Gmail.  However battery life for me is no better.  At this stage of the day, just home from work I should be over 50% battery.  I'm now at 43% with same usage.  I also mentioned above I've noticed quite a few slowdowns and stutters which wasn't there before and yes I factory reset and cleared the cache when I first installed.  

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Sad to hear that. My experience with Oreo has been nothing but positive. Phone is smoother and faster and battery life improved in idle and in use. 

Mind you I'm using a stock-based ROM called DevBase from xda with the latest kernel (3.18.91) and the phone is now running the latest bootloader ERG7 and modem ERG2.

What kernel version is listed in your software information under about phone? 

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3.18.19-13895453-qb18810069

[Xsever]

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@dj1891 wrote:3.18.19-13895453-qb18810069

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Are you sure it's 19 and not 91.

Mine is 3.18.91-13895453-QB18811252

[dj1891]

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@Xsever wrote:

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@dj1891 wrote:3.18.19-13895453-qb18810069

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Are you sure it's 19 and not 91.

Mine is 3.18.91-13895453-QB18811252

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Yes 91 sorry

[Anonymous User]

After the latest update G935FROM2ERG2, size 338.47 MB, I still have Cell standby drain my battery when 4G call is active and using mobile data.

[Carolll]

So it seems that after years that samsung is in the top smartphones makers they are not able to make a decent firmware and a still powerful device HAS TO at least or battery drain or lag in the most simple tasks. Well done samsung, as always. I'm still wondering how they replied to the report I sent where I mentioned planned obsolescence but my members app still keeps force closing 😂

[tbd]

Battery seems to have improved a little bit with the latest update for me, also the cell standby thing is gone.

However battery life for me was satisfying before and still is after the update, so no problems there.

[Olli0371]

It is may be a good idea to watch the real batterylife instead of looking in the statistics. I wonder if they are so smart to just modify the statistics to calm down the users as Samsung allready stated that this is an issue of ststistics only. 

Hehe.

Oliver

[James0071]

They're right about statistics; sometimes the accumulated % is 200

[Sylva1n]

Battery does last longer for me after the update, but since I'm away from home it could just be that the signal is slightly better. Still, if I reach 4 hours SOT, can't complain.

Just to be clear I also deactivated 4G calls (VOLTE) through my carrier's app (noticed a big improvement at the time), and disabled most of the bloatwares with a well known app.

[Carolll]

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@James0071 wrote:

They're right about statistics; sometimes the accumulated % is 200

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Percentage resets to 0% only if you charge your phone to 100%, so a 200% accumulated percentage is nothing strange

[dj1891]

How is everyone getting on with the new update? I've been running it since Friday.  I am downgrading back to Nougat.  For me battery life is worse and the occasional stutters are becoming annoying.

[AndreiFrom83]

Exactly the same- 20% cell standby. Zero improvement after the update.

[Joakim]

So now it's quite obvious - Samsung did it on purpose, they've intentionally decided to shut down S7 devices...