MacBook Air battery is draining faster after the Sequoia update

May be some incompatible service is causing the issue. I had the same issue with my M1 Macbook air after the Sequoia update. For me, it was an old (not fully compatible with the latest OS I guess) web cam utility that was causing the issue. Uninstalled it and looks like it's back to normal.

Open Activity Monitor > Energy Tab. Sort by Energy Impact.

Stop/Uninstall the one that's impacting (highest number) the most.

In Disk Utility>View, select Show all Devices, highlight the top left entry.

Run Disk First Aid on all items in the left panel, from top down.

Are you running any VPN, Anti-Virus, or Cleaning apps?

We need to see what all is running, a report from this will not display any personal info...

Using EtreCheck - Apple Community

EtreCheck is a FREE simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info. Give it Full Disk Access.

https://www.etrecheck.com/

Give etrecheck Full Disk Access before running.

Thanks for Old Toad’s etrecheck instructions…

Slow iMac 2017 - Apple Community

In Disk Utility>View, select Show all Devices, highlight the top left entry.

Run Disk First Aid on all items in the left panel, from top down.

Are you running any VPN, Anti-Virus, or Cleaning apps?

We need to see what all is running, a report from this will not display any personal info...

Using EtreCheck - Apple Community

EtreCheck is a FREE simple little diagnostic tool to display the important details of your system configuration and allow you to copy that information to the Clipboard. It is meant to be used with Apple Support Communities to help people help you with your Mac. It will not display any personal info. Give it Full Disk Access.

https://www.etrecheck.com/

Give etrecheck Full Disk Access before running.

Thanks for Old Toad’s etrecheck instructions…

Slow iMac 2017 - Apple Community

I had the same issue, when streaming a church service, the battery would drain even though the Mac is attached to the power adapter, and never had this problem before the upgrade to Sequoia. That was version 15.0 of Sequoia. I updated to the latest/greatest 15.1 and the problem has resolved. The battery stays fully charged while streaming.

Try that first before worrying about battery health, third party power hogs, etc. If things were fine before going to Sequoia they should remain fine, now that we're beyond a dot-zero version.

Hi Folks, I was having the same issue. After checking with a friend who has the exact same new Mac Air (bounght within a week of each other) who was having zero issues with battery life, I ran MacPaw Clean My Mac process and discovered that the update had caused an App to open at start up and run in the background. I uninstalled the App and things seem back to normal.There were also several other settings that had been returned to default that were potentially impacting performance. I am sure there are other ways to figure out what might be running in the background but it was a free trial of Clean My Mac and simplest for me. Hope this helpful to some on you.

It seems I have fixed my issue with fast battery drain. I have fully drained battery by using Mac till it's going to deep sleep by a low battery condition. I closed the lid plugged a power adapter and waited for a few hours to allow Mac charge the battery.

It is. I just did that, as announced earlier.

1. I'll tell you if the draining rate has improved after the downgrade (in a few days), confirming or not that Sequoia is a battery drain
2. downgrading will only work if you do a fresh reinstall, using a bootable device loaded with Sonoma install app.
3. If you try using a Time Machine, you'll get an error message telling, in substance: "impossible to downgrade from this version [Sequoia]". The Time Machine will only allow you to restore your apps and date.

The procedure takes some time and manipulations - backing up, erasing and reformatting your hard disk, downloading Sonoma installer from the App Store (free), retrieving your wifi password (wifi is required to register your machine again), apple account password and machine password - but otherwise simple and uneventful.

I'm having the same issue.  13" Macbook Air M1, 2021, 78 battery cycles, 94% health. I updated to sequoia about a week ago and then to the 15.2 betterversion. I still didn't notice any issues until today when I was watching a video on safari (iplayer, about an hour long). The battery drained from 75% to 35% during that hour which is absolutely insane. The macbook also got quite hot.    I checked in Activity Monitor under "Energy Impact" in the Energy section and messages was off the chart > 2000. I closed messages, opened again and it's again off the charts for energy consumption, with CPU also very high (105), even though it doesn't seem to be doing anything. it's possible it's downloading message history as there's quite a lot there though so maybe that's it, but I would have thought that wouldn't take longer than an hour. 

> Just did some more investigating, looks like it only does this when I have messages app open and set on a particular person's message history window. I'm not sure why. anyone have any ideas?

Open Activity Monitor in Utilities>View>All Processes>Energy tab, sort on Preventing Sleep, any listed?

The same issue on my MBP 13" Intel 2018. Battery level drops by 2% every 15 min. Ventura doesn't have such an issue. The issue appears on clean Mac OS Sequoia installation thus it is not 3rd party problem. I have reset SMC and PRAM also. Nothing changed.

System log trashed by tons of power messages every 100 ms

default 11:16:27.562731+0300 kernel IG:: disableDC6:5540 Disabling fast DC6

default 11:16:27.562760+0300 kernel IG:: hwWriteMailbox:4246 (command=22, data=0)

default 11:16:27.563954+0300 kernel IG:: hwWriteMailbox:4309 return

default 11:16:27.563977+0300 kernel IG:: hwSetPowerWellState:6912 PW: Updating power well hardware state to 0x20000002

default 11:16:27.563985+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x30000002

default 11:16:27.563991+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x30000003

default 11:16:27.563996+0300 kernel IG:: hwSetPowerWellState:6934 PW: Power well hardware state has been updated

default 11:16:27.563999+0300 kernel IG:: hwSetPowerWellState:6912 PW: Updating power well hardware state to 0x2000000a

default 11:16:27.564007+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x3000000b

default 11:16:27.564013+0300 kernel IG:: hwSetPowerWellState:6924 PW: Power well state = 0x3000000f

default 11:16:27.564016+0300 kernel IG:: hwSetPowerWellState:6934 PW: Power well hardware state has been updated

default 11:16:27.564300+0300 kernel IG:: restoreStateForFastDC6:24105 Restoring registers for fast DC6 exit. secondPart=0

default 11:16:27.564413+0300 kernel IG:: restoreStateForFastDC6:24105 Restoring registers for fast DC6 exit. secondPart=1

So this is the situation:

1. Sequoia 15.1 drains the battery
2. Sequoia 15.2 preview does not address this fundamental issue, pushing "intelligence" related features instead (more drainage ahead)
3. Apple does not even seem to acknowledge the issue

Sorry, I need battery life more than "intelligence".

"Downgrading" to Sonoma now. In fact I'll call it an upgrade. I'll further use sequoia on the other, desktop Mac (which is on AC all the time) and see if and when Apple comes to sense.

Most likely, there is some 3rd party system modification software that is incompatible and causing too much energy and CPU usage.

2 collègues ont un MB Air Mx, et ont aussi constaté après la mise à jour vers Séquoia, que la batterie se vidait très vite, même lorsque le Mac était en veille, et sans application gourmande en énergie.

I have the same issue. I turned off the computer yesterday at 8pm with 100% battery. I turned it on the next day at 1pm and it had 5% battery. Once I plugged it in the charger, it went to 57% instantly.