On this version I’ve noticed I get around 5-6 hrs of standby (maybe 5-7 mins of usage with light texting) before I drop from 100% to 99%, which is really good battery life for me on my IPhone 7. Usage, on the other hand, still sucks as bad as 12.3. This is with background refresh off however, so I’m going to turn it back on (both cellular and WiFi) and leave all apps enabled to see how it effects it. I’m not sure why Apple would leave background app refresh on by default if they explicitly tell you it can drain battery right there in the instructions.