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]

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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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@my 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

[LongDenis]

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.