My iPhone battery is acting weird. What should I do?

.Okay so my battery can be a bit jumpy. I have an iPhone 7 Plus and it's not a bad phone. However, it's been a tiny bit glitchy so when I go to restart it, the battery would jump. For example if I were to restart it and the battery is at 50%, and the phone restarted the battery would be at 55% and quickly go down. But, if I were to restart it on the charger and the battery was sat 100%, it would be at 97% and sometimes it would go down but when I put the charger back in the phone it would go back up at 100%. Is this to be of any concern or is it fine?

I mean you get a new battery put into the phone which could cost like $50-$100, but if its not majorly impacting you by having to charge your phone more consistently then i wouldn't, its not really worth it.

Thats surprising because I have iphone 6S+ still (4 years and counting) and it still works like new. I hate to even get rid of it because I like it but eventually the new hardware and camera is so much better I need to make that move.

What does this have to do with finance?

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