Hi.
Finally, my device is charging up to 98%.
Previously, one night was not enough to charge at 50%.
My problem was that I'm in France and I was using an AC Adaptator that changed 220v to 110v, only because it is the only thing I have to adapt the edge charger socket.
I bought a socket adaptator that is not an ac adaptator so the charger get 220v and not 110.
And now, it is charging correctly.
I mesured the voltage that enter in the edge : in both case, it is 12.2v.
Maybe it was the intensity that changed.

anyway, it works now .
Thanks.

Mike