Should I get a Hero13?

I already have a Hero5 but it doesn’t seem to stay on when I unplug the charger. My guess is that the battery can’t hold its charge anymore. I was thinking of buying a newer Hero13 but I don’t want to spend all that money if there aren’t that many new features compared to my current camera. Should I buy the Hero13 for its new features or just get my Hero5 looked at and maybe replace the battery?