Akkulaufzeit nach Update auf 26.09

try to reinstall

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    • push 8 times Light button (upper left)
      • then go to reinstall

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What is your wifi version ? Should 28.27

The reinstall worked. Unfortunately, the battery is still draining extremely fast. WiFi ist 28.27. But no connection

What kind of factory reset did you do? The are different levels from normal to - well - brute.

I'd suggest the following way:

1. Connect to PC and save the complete folder \Garmin\Text for later use, this is the folder with the language files, while you can restore it using GE it is easier this way.

2. remove from PC; charge to 100%, keep connected to the charger

3. Hold the watch with the two buttons START & BACK facing down so that you could hold down the two buttons with your thumbs or index fingers simultaneously

4. press and hold the LIGHT/POWER BUTTON for up to 30 seconds to turn off the watch, ignore the Garmin help display, keep pressing LIGHT until it switches off

5. it will switch on immediately if connected to the charger, press and hold the BACK and START/STOP buttons immediately after shutdown

6. After the first beep, release START/STOP; After the second beep, release the BACK button.

7. After the unit came up connect to PC again immediately. 

8. Go into the folder \Garmin and delete everything - BUT just the content inside the \Garmin folder! There will be some error messages since not all items can be deleted. That doesn't matter, leave those. You also my leave the map files to save time later, those won't really matter but you can reinstall them later using GE

9. remove from PC and back to the charger, the unit will restart which takes a little longer since the folders will be created anew, all except the \Garmin\Text folder

10. when the unit is again up and running, reconnect to PC and copy the missing \Text folder you saved before.

11. After that -> back to the charger, you may now do the setup. In your case I would not restore a saved backup since you don't really know where your problem was. When all is done (still connected to charger), do another power cycle  by pressing the LIGHT/POWER button until off and let it come up after that.

Now your system should be at 100% battery still and reset in the hardest possible way.

From my perspective I can say that while was able to recreate many problems described here with 26.09 (or 21.19 - 226.09 for that matter) I never experienced any problems with battery drain so far.

Imho it is important that you go thru all steps which will need more battery than normal operation (like full resets and updates) while connected to the charger in order not to confuse the very fragile power management learning cycle.

Disclaimer: If you are still under warranty you should ofc contact Garmin Support, they will give you a lot of homework before you can do anything, but AFAIK at least downgrading is not a supported way. and you may want to make sure that your warranty isn't voided. I just wanted to mention this....