Problems with Innokin Endura M18

I bought two Innokin Endura M18's, and both seem to have problems.
The lights have gone out. There is no way to know the battery power, when they are fully charged, etc.

And now both of them don't seem to vape very well, like there is a air leak. I am using the Innokin M18 tank/coils with them.

Does anyone else use the and how has your experience been with them?

Original source: https://www.e-cigarette-forum.com/threads/problems-with-innokin-endura-m18.966911/