This happend to me recently. So I put a uncharged battery in the Tello and connected the Tello to the power. The battery charged properly. I then put the charged battery in the charger with the two other uncharged batteries. The charger then worked as normal on all three and has worked normally...
I'm new to drones and got a Tello & GameSir about a month ago. I'm starting to get the hang of it but have gone through a bunch of propellers. No worries, a new batch are in the mail.