battery drain /descarga de la bateria

I can confirm that. Lost 30% battery over night. There must be something wrong. It only lasts 4 days now although it shows approx. 13 of usage. Hope you can fix that asap. Thx in advance.

Solución apaga el forerunner presionando el botón light, espera 1 minuto y volvé a encender, si a parte desactivas la pulsioximetria dura mucho más la batería.

Solution: Turn off the Forerunner by pressing the light button, wait 1 minute and turn it back on. If you also deactivate the pulse oximetry, the battery lasts much longer. 

I set this option to only measure over night and had 13 days before the last update. Do you mean a restart will fix that?

Yes

Maybe I found another battery killer right now. The clock was always on search of my new HRM-Pro Plus. I turned this option off now.

Siempre después de cada actualización de software reinicialo, y si pones la pulsioximetria a demanda y no por la noche te va a durar más la batería

Always restart it after each software update, and if you put the pulse oximetry on demand and not at night, your battery will last longer

The restart is mandatory within the update. ;D

I know about the battery usage of the pulse oximetry. But I use it currently for a reason. As mentioned before I think that turning off the search for HRM will help me a lot here.

My battery also only lasts 3-4 days now. Lasted about 2 weeks before the update to 19.18. I have tried all of the suggested fixes for battery problems I have found when googling it, but nothing works. Have contacted Garmin Support but they are hesitant to replace the watch and are just suggesting a lot of things I have already tried - although I have already said I tried those things. Pretty sure this doesn't have anything to do with my settings or usage of the watch (as it has not changed), but the software update.

Mira yo no creía que con apagar, esperar 1minuto y volver a encender se solucionaría pero así fue, lo que también te puedo decir es que también puse la pulsioximetria a demanda y no fija durante la noche, el cambio fue radical, de cargar cada 4 días post actualización, ahora la batería me dura en torno a los 20 días

Do you have any external sensor in use?

Or maybe you can try to make a complete backup of the clock to your pc and then reset your clock with factory reset option.

After that you load your clock backup from pc to your clock again.