Tello battery not charging (blue light blinking fastly and stoping in a loop)

[Gramosek]

I decided to play with my tello after a few months but now the battery does not want to charge. There is a fast blue blinking light that stops in solid blue light for 2 seconds and then blinks again and like this in a loop. Anyone can help?

 

[Whiterasta]

I'm having the same issue 4 x short 1 x long blue light flash then repeat but not charging at all

 

[bughat]

just got my new battery and it's the same.i'm thinking the tello has a problem.

 

[ajsamuels]

I had the same issue a while ago with one particular battery. I followed advice from another user to leave the battery charging in the Tello overnight. By the next day the battery had fully charged (green light). After that the battery functioned correctly.