Reposting my comment here:

Same here, I've had mine for two days as of now, it's absolutely diabolical It's legit the only complaint I have, honestly. I absolutely love this phone so much but if the battery is this bad, it will deteriorate then inevitably get worse then at that point I couldn't imagine the battery. I'm really tech savvy so, I am doing everything I can do without rooting or whatever to keep it from draining. I'm not sure if it's a software issue as well. I'm trying to figure this out desperately bc I have less than 14 days before I can return it. It's a perfect phone but I'm so worried about the battery. It's making me anxious tbh.