Clearly you are not stuck in a boot loop or you wouldn't be able to post that screenshot.
Batteries degrade over time with usage due to chemical aging, that's just how they work.
You can expect about a 1% drop per month with average use on an iPhone.
Apple recommends replacing it when it reaches 80%.
85% should not cause this behavior, make an appointment at the Genius Bar to have it diagnosed.
Genius Bar Reservation and Apple Support Options - Apple
mennaabozaid1 Said:
"My iphone restart himself every 2 hours I don’t know how and I bought my phone 8 months ago and the battery became 85 in addition to that I do all the instructions and I have the original"
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Thank you for the screenshot.
Trouble;shotonig a Restarting iPhone:
A. Being Stuck in a Boot Loop:
Your iPhone apparently is stuck in a boot loop. And this typically happens when you unsuccessfully download somethings or an install is incomplete. So, refer to my User Tip: How to Fix an iPhone in a Boot Loop - User Tip
B. About Battery Drain:
This is normal. Unfortunately, there is no way to know how, nor when, the Battery Health drained. It's all just a gustation on Apple's part. I've even seen my percentage increase at times. All batteries are prone to failure. So, no worries there.
My iphone restart himself every 2 hours I don’t know how and I bought my phone 8 months ago and the battery became 85 in addition to that I do all the instructions and I have the original
