iPhone 7 Plus Standby Battery Drain

The first thing I would do is check in Settings to see what app(s) are using the highest percentage of battery on the device. I doubt that mail and maps would be causing an issue unless you have the device set to fetch mail multiple times during the night. What is your fetch schedule for your mail? And unless you have maps open and doing something overnight, it should not consume any battery whatsoever.

I'm using an iPhone 7, not a plus, and I have found that despite my rather heavy usage, I still have battery left at the end of the day. I plug the phone in at night when I go to bed and have 100% when I get up in the morning, again, lasting from 6:00am until around 11:30pm with battery to spare.

mdeldridge,

Go to Settings > Battery and scroll down to BATTERY USAGE to see the apps that are consuming your battery. If any of the apps have unusually high usage they can be shut down (double tap the Home button, scroll left or right to find the app, then swipe up to shut it down).

As time goes by you should be able focus on the problem apps. Usually it is a rogue app constantly running in the background. You should then be able adjust the settings to the problem app to solve your problem.

Let us know how it goes.

Your overnight usage shows that 8% of the 8% of battery that was used overnight was music, and that there was 10 minutes of usage overnight. Then again, the usage statistics are for the past 24 hours. That isn't bad, however you show that 7% of battery was being used by deleted apps. I suggest that is where part of your problem lies. You have something going on there, such as a stuck process. Mail is not showing usage, and I've not seen Mail problems with my iPhone 7. My biggest battery hog is Twitter. I've been busy with other things today and have not spent any time there, and my battery is phenomenal today. I've been on it since 6:30 today, and have been receiving and responding to my usual amount of mail, and my battery is still at 95% for having been disconnected from the charger for 7 hours. I don't believe overnight is going to give you enough of a clue, since the battery usage statistics are over a 24 hour period of no charge. I have wi-fi Assist off as well as Background App Refresh, since I don't use anything that would need that. I have Raise to Wake off since I keep my phone in my pocket and moving it would cause an issue. I've never heard that Shake to Undo uses battery enough to turn it off. Auto Brightness is the best choice to leave on since it keeps the screen at a minimal brightness. I wouldn't turn that off or believe it is causing battery issues.