iOS 10.02 draining battery of my iPhone 6s

I've been trying to figure out how to fix my iPhone battery life after updating to iOS 10 and now iOS 10.02. I used to be able to use my phone for two days with no issue, I barely have any notifications, no background app refresh or location services and I can't figure out what else may be causing it. Everything I read is meant to be about iOS 10 but it looks like iOS 9 - does any one have any tips? Thanks 🙂