So after about 3 months of struggle with the tango and taking it apart to charge the batteries I decided to post this here because it is another product which I would not recommend anymore, but lets see perhaps someone has a solution.
I bought mine on christmas 2016 (about 8 months ago) and first I was convinced that this is the best radio I ever had. I used it all the time (now over 200 hours of flying), even if the long charging process via usb annoyed me a little bit. But Ok on the other hand side, USB is very convenient, so that was O.K. for me. After about 3 months, I had the same problem that a colleague of mine had before. The tango did not load the batteries anymore via USB. The red light is on, also the PC can be connected and the battery indicator indicates that it is charging. BUT, it actually does not charge. So I tried different USB cables/slots on my computer and a smartphone charger.... nothing. From there on I had to unscrew the whole device, take out the batteries and charge them. Even if there other problems came up with time which are a little bit disturbing this is the only one which really makes the whole device inconvenient and I personally would not buy this anymore
If anyone has a solution for this, I would be very lucky.
Best regards,
Midorr