For me, downgrading to ANT_BLE_BT_v5.04 solved my issues and a few of us have had success doing this if you search the various power drain threads. After downgrade I am using approx 0.3% battery per hour, or put it another way over 20 hours, battery drops 6% - this is of course without any activities.
Hi. Today I tested my watch due to excessive battery drain and conclusion are: I turned off permission for Connect app to access location services from Always to Only when using app and battery drain back to around 6% per 24hours without using gps or any activity which I believe is decent as it gives roughly 16 days of battery life.
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garmin fenix 3 hr battery drain