A:Answer Hello,
I am sorry to hear that your left Sport Earbud is no longer charging.
Please make sure nothing is damaged on the earbud and that the connectors on the charging case are free of debris. Also, I would suggest resetting the earbuds, following these steps: https://support.bose.com/s/display-articles?productId=01t8c00000OydAYAAZ&articleId=ka08c000001bufcAAA&language=en_US
If you need further help, please contact our support team: https://bose.life/contact
Best regards,
Lau - Customer Support