Hi, I have a Galaxy Watch Active 2, 44 mm for now about 4 months. I set it to monotor my heart rate and stress constantly and wear it day and night. My battery life is constantly 3.8 days! After 2 days, the battery level is about 50% so I recharge. This is now 4 months in a row and seems stable. So for battery life I think the Active 2 is really great. Maybe a factory reset and leaving the settings to default will help you. I encourage you to put the Active 2 to constantly monitor heart rate/stress and wear it day and night. I gives, combined with Samsung Health a fantastic informative report on your sleep patterns as well.
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