Fenix 8 Solar 51mm firmware 12.35 battery drain

I think sometimes, the reset clears out the physical memory and RAM resulting in fewer more efferent handoffs of data in the OS which will help in battery life. Speculation on my part. 

I followed your lead, also master reset. Did you restore a copy or reconfigure from scratch?

Hope Garmin will fix it soon. I‘ve Never seen a 1000$ watch which had only 50% of its adversed battery life 28days vs. 14 days in general 

I have the non-solar edition fenix 8 (47mm) and since 12.35 I have a huge battery drain than before this version. Charged it today to 100% and 6 hours later the capacity is down to 90% with just a 15min HIIT workout done. 

I do not use any Connect IQ Watchfaces, no Voice Assistant, only iMessage- and health-notifications enabled. No PulseOx. 1 alert in the morning, no music, no animations, no always on display (only in workouts)

Previous the last update I did min.1h gps workout (running) daily and same settings otherwise as described above and after a week battery was down to 50%. 

With this huge battery drain the Apple Watch Ultra I had before was similar with more going on beside sports…

Any ideas how to proceed? Any news on updates?

Yes !!  There is definitely an issue with 12.35.  I have the Fenix 8, and ever since installing 12.35, battery drain has been terrible.  30% or more / day - even when barely doing anything.  Previously it was the 5-10% range / day.  From what I've read in other forums / boards - the theory is GPS or some activity is still 'running' even when you've stopped that activity.  The only way that's been shown to help is to reboot, which likely kills that process.  Hopefully Garmin can figure this out and get us an update.  Having to constantly reboot a $1000 watch to prevent battery drain is not a good solution.

I’ve lost about 2 days of battery life after the 12.35 update. Before that full charge prediction was 16+ days on 47mm amoled, now it is about 14 days and it seems to be consistent with the actual discharge. I did factory reset and then restore from backup to make sure that the settings were preserved between updates.

Hi,

I have a Fenix 8 (47mm) running Software 12.35, and I’ve noticed significant battery drain since last week’s update. It dropped from 100% on Monday evening to 14% by Saturday morning, with no changes to my usage—3 workouts as usual and no setting adjustments that could explain it.

I restarted the watch a few times because the heart rate seemed inaccurate during training. After charging it yesterday around 17:00, it’s already down to 92%, which still feels faster draining than normal. I usually get 16–18 days of battery life.

This seems linked to the recent update. Is it possible to revert to an older software version?

Kind regards, and have a great Sunday!

My battery is noticeably draining faster, than before 12.35. A fully charged my 51mm watch yesterday morning, had just one walk with dog and today it shows 94%, 27 days remaining...