How to know that your battery if full on an IPhone

Hello! I just want to know how IPhone shows that your battery is fully charged. I recently bought an IPhone SE IOS 11, I never used one before. I am Android user I thought try something different but I cannot find that on my IPhone. Is there any kind out indicator on IPhone. In Android you can see it easily.....
Please reply or post and screenshot of fully charged battery.

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