Hello somanakhil,
Welcome to Apple Support Communities. It sounds like you're having trouble with your AirPods Pro. We are happy to share information that may help.
You mentioned that your right AirPod Pro is draining more quickly than the left. On your iPhone, under Settings > Bluetooth > AirPods > Microphone, check to see if the microphone is set to "Always Right AirPod." If it is, try changing the setting to either "Automatically Switch AirPods" or "Always Left AirPod" to test the issue.
You mentioned that your AirPods sometimes don't charge. Make sure that there isn't any debris inside the case or on the connectors: How to clean your AirPods and EarPods.
You can find more information about charging your AirPods here: Charge your AirPods and learn about battery life.
Take care.