Only 2 days for AOD

But what about activities? Do you track any or have Auto activity turned on? Garmin claims 5 days with AOD on, but with no activities done and with the sleep schedule turned on (I guess 8 hours of sleep). More factors include brightness and the number of hours spent outside (Auto brightness will increase the screen brightness outside, resulting in a higher drain).

I haven’t tracked any activities last week as I’ve been busy with school. Speak of school, that means I’ve been inside for most of the day and so I have auto brightness turned on and it seems to be at half brightness. I have Move IQ turned on but turning it off didn’t affect the battery. Also sleep schedule is turned on.

Okay. Maybe you can try lowering the brightness. My brightness is set at 20% (I have turned off auto-brightness as it is too bright for me). Just give it a try with that setting for a day and see if things improve. I am not sure if 50% brightness is good or bad, but having it at 50% for most of the time seems a little too much for me (excluding really bright outdoor days and your watch also could pump up more brightness indoors on such days). It is just a suggestion, if you have time, do try it. 

My settings are (I have the Venu 3):
Brightness at 20% (auto brightness OFF); AOD is off; Glance is off (sometimes when I work it is distracting, I don't want to see the time or any notifications); Notifications arrive when Bluetooth is ON (for some apps only); Pulse Ox set to on-demand; Sleep schedule turned on, watch goes to redshift mode; watch goes to redshift mode during activities; custom watch face; no music listening from watch; with all these settings and some activities, I get like 8-9 days of battery life.

In my opinion screen brightness seems to be the biggest issue for you. Try reducing that and experiment again. Btw, you have the Venu 3 or Venu 3s?

Okay, I'll try that out. I have a Venu 3s

Are you gong by what the watch predicts (you implied this) or what you experienced? You should test it yourself. I can get about four days with AOD, a 40 minute GPS activity every day, and other exercise activities about three days per week. I use auto-brightness and have some notifications sent to the watch. I have a scheduled sleep time of about 6.5 hours for which the screen is off.

Different watch faces affect battery life, so try a few different faces.

Great. You can try that and update it here. I never use AOD so I cannot comment on my battery life for AOD. But as mentioned in my previous comment, I get 8-9 days of battery life with activities using those settings. I am kind of happy with that.