Battery issues with earphones

Mostly I use earphone while driving for taking call or listening music and unusual things happen with my battery in battery life I found that USB type C has used 16%of my batteries I connected customer support and they said there’s no problem with Hardware or Software and guided my some troubleshooting and asked me to keep noticing this issue and if the same thing happens again contact us.

If anyone facing same problem please share your experience.

Please not I am using Apple Original earphone.

Attaching some screenshots for better understanding