Hi Bavani Owen,
Welcome to Apple Support Communities. I understand that your right AirPod isn't holding a charge as long as your left AirPod. I can see why you'd reach out about this; I'd like to help. I appreciate you including that you've already checked the microphone settings for the AirPods, it's most helpful to know. While it may not be possible to determine the cause of the additional battery consumption, I'd suggest trying these steps, then test your AirPods again:
If you continue to see the right AirPod use more battery than the left, reach out to Apple for additional assistance: Get Support
Alternatively, you can have your AirPods examined at a nearby Apple Store or Authorized Service Provider: Find Locations
Best Regards.