Iphone 11 Pro, Mail app draining the battery in background.
If anyone has had this problem, I have found a solution, my mail app was running constantly in the background and draining the battery, e.g. from 100% to 20% overnight. I have been in contact with apple support who were very helpful but did not solve the issue, I believe its a problem with ios 13.xx, I have 13.4 Anyway, I tried everything even turned off all my mail accounts, turned off fetch, turned on low power mode, none of this worked. I did a hard reset and restore with no success. I eventually deleted the mail app and downloaded outlook for ios from the app store, I have set up my mail accounts again on this and it has cured the problem. (no more battery drain)
It seems there is a bug which is affecting the Iphone 11 pro, because I also have an Iphone SE with ios 13.4 installed which is not affected, I would still prefer to use the original mail app but will wait for the next ios update to try again.
iPhone 11 Pro, iOS 13
