I can only repeat my point from the other the thread: If I reduce interval calls the battery lasts longer. The more interval calls I have the more dramatically the battery duration drops. Just an observation for my case, but I like to remind to this.
In detail: my watch app has an interval event even without active display every second (yes it's not best pratice, but for this although a good idea) Battery lasted with V5 more than one week, even if I paint the watchface without display on. If I do it now with latest fw battery lasts two to three days. From my point of view the interval causes got more battery consumption. I can't tell where the underling problem is (e.g. power saving). But maybe this is a hint.