My girlfriend is complaining about the battery life on her iPhone 7. She charges overnight and starts the day on 100% and she will normally have about 30-50% battery left when arriving home after work depending on how much she has been using it throughout the day. But the past few days she complains about her battery dropping to below 20%, even on days she barley uses the phone. I have tried to figure what might causing the drains and according to the battery settings the default Apple Mail.app has managed to drain 24% (!) of the battery in the past 24-hours. That's a ridiculous amount of battery for the mail.app to drain! And it even claims it's only been used for 4 minutes in the foreground, and 1 minutes in the background? She normally receives 2-5 mails per day, and they usually don't contain anything other than plain old text and nothing fancy. I'm using the default Mail.app myself on my iPhone 6S Plus (have yet to receive my iPhone 7 Plus Jet Black) and I have yet to see the mail.app even show under battery tracking as it has never used more than 1% battery life. And I receive a much larger amount of e-mails compared to my girlfriend on a daily basis. What's going on here? Is it bugged? She has two accounts, one that use Office 365 / Exchange for work, and the other is Gmail. I on the other hand only use a Office 365 / Exchange e-mail and nothing else. Is it Gmail that is bugging? Her settings is set to "Fetch" as Gmail don't support push in the Apple Mail.app for some stupid reason and her fetch intervals was set to manually so I can't for the life of my understand why it should be having issues when it's not supposed to do anything on it's own.