IPhone 7 keeps shutting off?

No matter how much battery it has it just randomly shuts itself off when I'm using it. It won't turn back on unless I plug it in. It says it has no battery but it has a lot when it turns off. I've tried rebooting it and it didn't help.

Looks like it's a battery, I used to have the same problem

Maybe it has water damage. My friend left his in some water for a couple hours and even though it was waterproof it didn't work but he put it in uncooked rice overnight and it suddendly worked

Should let an Apple Store know about it.

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