Reduce battery drain when not wearing watch

I wear my 970 for sleep and workouts, but I wear another watch during the day. I was getting annoyed with my 970 constantly buzzing for notifications when I wasn’t wearing it, so I started turning on “Do Not Disturb” mode every time I took off the watch. What I accidentally discovered is that this massively improved my battery life. I guess all the vibrations and screen wakeups was draining the battery but turning on DND stops that and reduces battery drain when not wearing the watch.