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Thx for your feedback.

So it must be something else?!

Within Console I do find a lot of the following reports within system.log:
XXXXMBA com.apple.xpc.launchd[1] (com.apple.mdworker.shared.ABCDEF-GHIJX-0000-0000-000000000000[xxx]): Service exited due to SIGKILL | sent by mds[300]

Don't know what this is?
mds is Spotlight. How often does this appear in system.log?
 
hmm mine also appears to be draining whilst doing nothing (lid closed)

1608729524483.png


1608729570036.png
 
hmm, does this setting (Wake for network access) under Power Adapter effect the MBA when on battery? I took it as only effective when plugged in.

1608732447495.png
 
On my M1 MBA I have icloud enabled, with no extra configurations, wake for network enabled. The only thing I've done is clean out the Google/Chrome cruft from my system. I have no issues with battery loss during sleep.
Screen Shot 2020-12-23 at 8.02.49 AM.png
 
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How much are you losing overnight?
Last night, with the battery fully charged before sleep, zero (as shown in my screenshot). But normally seems like 2-3 % maybe. Could just be that there is a bit of a buffer "above" 100% that was used last night.
 
Last night, with the battery fully charged before sleep, zero (as shown in my screenshot). But normally seems like 2-3 % maybe. Could just be that there is a bit of a buffer "above" 100% that was used last night.

2-3% overnight seems normal discharge. Mine is the same & few ppl here seem to have same levels of discharge.
 
Had the same problem with my new MacBook air M1. Seems to have resolved itself now. Last night drained approx 20% in standby in 11 hours which was a concern. I have just recharged and it has stayed at 100% after 6 hours in standby which is much more like it.

I changed 2 things that I can think of 1. Unchecked wake for network access as per suggestions in this thread 2. Unplugged my wireless mouse adaptor when closing the laptop lid (i.e putting into rest mode). I had previously just left this adaptor in the Mac when I closed the lid.

This is my first Mac so not sure if this is a stupid suggestion, but could it be the mouse adaptor keeping the computer awake whilst in rest mode (i.e searching for the mouse)?

Anyway, thought I would mention in case this helps...Will update if anything changes..
 
Had the same problem with my new MacBook air M1. Seems to have resolved itself now. Last night drained approx 20% in standby in 11 hours which was a concern. I have just recharged and it has stayed at 100% after 6 hours in standby which is much more like it.

I changed 2 things that I can think of 1. Unchecked wake for network access as per suggestions in this thread 2. Unplugged my wireless mouse adaptor when closing the laptop lid (i.e putting into rest mode). I had previously just left this adaptor in the Mac when I closed the lid.

This is my first Mac so not sure if this is a stupid suggestion, but could it be the mouse adaptor keeping the computer awake whilst in rest mode (i.e searching for the mouse)?

Anyway, thought I would mention in case this helps...Will update if anything changes..
I am beginning to think that the "wake for network access" only has a little impact on overnight battery drain. Unless there is a lot of activity on iCloud. Even then so it shouldn't impact the battery charge too much.
 
So my previous screenshot showing drain overnight had a Yubikey plugged into one port, removed that and back to expected overnight.

1608801811054.png
 
So my previous screenshot showing drain overnight had a Yubikey plugged into one port, removed that and back to expected overnight.

View attachment 1700317
Interesting. So perhaps it's a bug that has something to do with peripherals? I wonder if this will mean excessive battery drain when using usb mice etc?
 
that screenshot was taken from my mba m1
Ok - crazy. So why don't I have this feature? Maybe missing translation, as I'm using it in german language?

EDIT: Tried it with English - the same. Menu point not there... MBA M1 16GB 1TB
 
Coming back from the apple store, they aren't aware of the issue although they had a similar case with an M1. They need to keep the laptop a couple of days... I'll let you know when back. I bitterly regret not returning it to the premium reseller.
 
I had exactly the same problem with my MacBook Pro M1.
This was the 35% overnight battery drain two days ago:

Screenshot 2020-12-24 at 20.13.45.png


Then I disabled "Wake for network access" and updated to Big Sur 11.1.
This was the battery drain last night:

Screenshot 2020-12-25 at 16.19.35.png


Really happy that it solved the issue since I thought I was going crazy with everyone raving about the amazing battery life. Still a strange issue and the more so as not everyone seems to experience it. Hope this helps someone.
 
I have the 'service recommended - capacity is significantly reduced' warning in my battery settings (m1 macbook pro, 1tb 16gb). Battery health is at 100% (5103 mAh/5103 mAh, 11 cycles, 26 days old) and I ran diagnostics on restarting which found no issues. I see around 10-12 hours use out of it, definitely not the crazy hours others are getting though I'd say I'm a heavy user (blender/Ps etc). Googling around I noticed some saw this error message in Big Sur as a bug during beta over the summer... Should I be worried? I've been rendering in blender this morning and seen 45% drop in 2 hours.

EDIT: After a good hour with in their chat support (where the guy twice advised me to reset smc using a method that only works on intel macbooks) I have to go get it serviced in store. Bah.
 
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How did you find out?
Cycles count and some other info is here: Hold the Option key and click the Apple  menu. Choose System information. Under the Hardware section of the System Information window, select Power. The current cycle count is listed under the Battery Information section.

Then I have an app called battery health 2 from the app store which shows similar stuff but also mAh/age
 
I had exactly the same problem with my MacBook Pro M1.
This was the 35% overnight battery drain two days ago:

View attachment 1700968

Then I disabled "Wake for network access" and updated to Big Sur 11.1.
This was the battery drain last night:

View attachment 1700969

Really happy that it solved the issue since I thought I was going crazy with everyone raving about the amazing battery life. Still a strange issue and the more so as not everyone seems to experience it. Hope this helps someone.
Where is this option "Wake for network access"? I can't find it under the battery tab?
 
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