How to test the phone battery?

Hi Everyone, I purchased a Samsung S20 FE 5G in mint condition from Swappa, I am a bit skeptical about the battery life, I have doubts that it is draining faster than usual, I know, after all, it is a used phone but how can I tell if my phone battery is functioning properly?
I came here with the sme question. Who was the seller? If we have the same seller, maybe this will give us more info.
Chatgpt says if the battery has not been in use for several years it will degrade faster. I have purchased several phones over the past month and I am having the same problem. The corporate sellers know this but are not telling you.
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