Terrible new firmware version 14.10 - Dramatic battery drain

Revert back to 13.30, disable Auto Update and do not use Garmin Express on PC for sync.

13.30 works fine and there is no battery drain.

In fact keep it like that!

I reported it last week to Garmin UK Support via their online chat, they said it was my watch and gave me a return number, I asked them if this is a SW issue like experienced before, they said no.

Sent my watch back recorded delivery at my own expense, received a refurbed watch yesterday, was ok to start, it then updated to 14.1 before I went out for a 1 hour walk activity since then it has been dropping 1% per hour.

I have charged to 100% and will monitor overnight to see what happens - If it continues at 1% per hour I an going to ask Garmin to refund the postage for sending back a perfectly good watch due to their SW issues!

Last week! There's a mile long thread of people with battery drain on 14.1 and a longer one on 13.4 and support don't even know about it a week ago?

That's shocking..

Same thing happened to me too. Their support staff should know about the software issue and tell us that vs sending us a new watch. This costs them money etc. and doesn’t help us the end user either. 

Do you have instructions how to rewert back?

1. Download and unzip fenix_***Beta.zip
2. Place the gupdate.gcd file, found in the System_v*** folder, into the \GARMIN folder of the device
3. Place the gupXXXX.gcd file, found in the Sensor Hub_v*** folder, into the \GARMIN\REMOTESW folder of the device
4. Place the gupXXXX.gcd file, found in the GPS_v*** folder, into the \GARMIN\REMOTESW folder of the device
5. If you have a WiFi-enabled device, place the gupXXXX.gcd file, found in the WiFi_v*** folder, into the \GARMIN\REMOTESW folder of the device
6. Place all files found in the Text_v*** folder into the \Garmin\TEXT folder of the device
7. Disconnect from your computer and proceed through the update.
8. If you would like to revert to the last public release software, drop the gupdate.gcd file, found in the System_Backdate_v1250 folder, into the \GARMIN folder of the device.
9. NOTE: If you revert to an older version of software, all of your settings will be reset to defaults.

go here https://forums.garmin.com/outdoor-recreation/outdoor-recreation/f/fenix-5-series/168440/fenix-5-series---13-51-beta-release

and select your device, the how to do is at the bottom on the page.

They have released the new 14.20, apparently they have fixed the problem: 

https://support.garmin.com/en-US/?faq=WyBTzX43H58sDwnGBoK5m7&productID=552982&searchQuery=Increased%20Battery%20Drain%20After%20Updating%20Software&tab=topics