iPhone 6,7,5C Messages and battery

[Eduardboon]

Hi there,

I've had an iPhone 6, 7 and 5C and they all have the same problem.
I setup all the phones as new phones with a DFU restore but every time this issue persists:

Messages kills my battery. Yesterday, I used messages for 17 minutes on-screen and it shows 2 minutes of background activity, but it accounts for 36 percent of my battery. On the second place is safari, with over 3 hours of webbrowsing at 22 percent. I am at my wits end and am really close to just disabling imessage since I can't get through a day because of this issue.

Is there anyone out there that has experienced a similar thing and has fixed it?
For iMessage I use my mobile number and a single mail address. My girlfriend has used the same 5C without ANY problem whatsoever with also her mobile number and an gmail address for iMessage. She would end the day at 30 percent battery while I have to charge twice a day (once for iPhone 6 and 7) to get through a day. This is ridiculous.

Summary; Messages is the top user of my battery, the battery screen states "Messages - background usage - 2 minutes". It is the same every day and I don't even use iMessage all that much.

 

[Eduardboon]

Alright, small update; I just logged out of my Apple I.D and that seemed to help a whole bunch. Sucks that I can't use mail addresses now.

 

[Eduardboon]

The fix described in my previous post did not work. For a while my usage was fine. But after using iMessage for 20 minutes I dropped from 80 percent to 37

 

[Eduardboon]

Alright guys,

I restored the 5C in DFU mode. AGAIN. and this time it drained the battery flat in about 3 hours. Phone was in my pocket all the time, no apps installed. Nothing. Figured out it had drained when I had to make a phone call. This is ridiculous. The only thing that seems to stop this is to not login to iCloud. That should have nothing to do with this