My new iPhone 12 battery doesn’t work after a few months
Why can’t I see my battery percentage
iPhone 12 mini, iOS 14
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Assuming the text of your post describes the real problem... You should see the battery indicator near the top right corner of your Home Screen. Swipe down on this corner and the current charge percentage gets added.
If on the other hand you think you have a failed battery, contact Apple Support to arrange checking and repair.