Hi all! Happy New Year!
Just in case you get something similar...
When I try to download an Spotify playlist to my Forerunner 945 LTE: it asks "Fi-Fi is off. Turn on?" in order to download the content and, after answering "yes", an error saying "Battery is too low to connect to Wi-Fi" is shown in spite of having a 100% full battery.
No success after having tried to reinstall the Spotify app, using a different Wi-Fi, switching off/on the Wi-Fi before the action, downloading with the watch plugged to a charger,...
-SW (system, Wi-Fi,...) versions seems up to date.
Cheers!