So for the last few months my iPhone 7 Plus has been suffering from terrible battery performance. I'm on the latest beta but it's been the same on all of the recent ones. As of today my battery status shows 9hr 18min Standby and 8hr 38min Usage - I've had the phone unlocked for an maximum of an hour since it was taken off charge! I'm currently on 9% battery. Occasionally it doesn't happen. It seems to happen more often when I'm at work than at home, although it's almost always on wifi. I've tried closing all apps, rebooting and then opening apps one at a time in case an app had a memory leak or was staying active but I can't find anything consistent. Only default iOS apps have been open today and it's still happening. I'm aware I'm using things that will drain the battery such as being paired with an Apple Watch, having Geofencing active for Philips Hue, push notification for emails, IP Cameras and Find and Friend etc. but I've disabled background app refresh for most apps and I don't have the same issue everyday. The battery usage by app, reported in settings, doesn't show anything particularly high. Also, the fact it shows % used in the last 24 hours rather than since last full charge makes it difficult to diagnose. Any ideas?