Right AirPod pro dying quicker than Left AirPod pro

Right AirPod pro dying quicker than Left AirPod pro

I’ve been charging both of my headphones simultaneously, but for some reason my right headphone keeps dying. It makes the sound of low battery but when I check it out, it’s at 45%, then it dies. What could this possibly be? It only lets me listen to music for about an hour, then the right headphone shuts off. I make sure they are fully charged at 100% every time.