Left Airpod got mixed up and switched and someone else ended up with my left earbud and I got theirs so the left is not recognized by the charging case. Charging case and right airpod work perfectly but dont know the process of de registering and trying to sync the left bud. Maybe be able to figure it out yourself. I just would rather not have to wait at the apple store for an hour to find out. But good luck Charging Case Serial H19DL9700C6L Apple A2084 H1FDLHPROC6K (Left) Apple A2083 H1FDLGDHOC6J (Right) Noticed the 4th photo. The one on top is the one that works which came with the case, the bottom is the one that is not synced and probably belongs to someone else. Different model #s and serial #s