Battery drain after update 15.20 version

Not that bad, but  yes, since the update mine seems to be draining faster.

Same problem, charge lasting half the time it used to

In case you haven't tried it yet, try switching the watch off and on again, it seems to help often. Sometimes a non-stock watchface behaves differently after an update, if applicable to your case, you can try if using a stock watchface makes a difference.

I have not seen such big battery drains with this update myself.

Me ha ocurrido lo mismo, desde la actualización la batería del reloj me dura apenas un día. He preguntado al servicio técnico y me han dicho que espere a que salga una nueva versión. Pero claro, salgo a hacer una actividad larga y no me dura el reloj un día... 

Alguien sabe como se puede volver a una versión anterior del software?

Translated: "The same thing has happened to me, since the update the battery of the watch lasts barely a day. I have asked the technical service and they have told me to wait for a new version to come out. But of course, I go out to do a long activity and my watch does not last one day ... Does anyone know how to go back to a previous version of the software? "

First try to restart your device: see manual.

For downgrade to 14.00: download the last beta here. Go to installation instructions at the bottom of the page: "If you would like to revert to the last public release software, drop the gupdate.gcd file found in the System_Backdate_v14.00 folder in the \GARMIN directory." Beware: All of your settings will be reset to defaults.

Wait for a new version?

If the recent release schedule is anything to go by that'll probably be next year