My right AirPod dies significantly faster than my left

I noticed that my right aipod dies significantly faster than my left. They're both at 100% when i use them but after half an hour or so my right airpod only has 70% remaining while my left still has 90%. I wondering if its a battery issue but airpods usually last for a year or more. I've only used mine for 6 months. If anyone knows what to do or how to fix this, that would be greatly appreciated.

Thanks

[Re-Titled by Moderator]