How do I know if my battery is originally
I want to know if my battery had been replaced
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This question was answered in the past and even has a response by a community member recommended by Apple: How to check original iphone battery? - Apple Community
You can also read this support page about genuine iPhone batteries: About genuine iPhone batteries - Apple Support
On April 27, 2022, Apple announce a self service repair kit that users can buy to fix their iPhones. This would include a genuine battery. You can read about that here: Apple’s Self Service Repair now available - Apple
You can also learn about how to repair your device if you're having battery issues (or by contacting Apple Support): Self Service Repair - Apple support