RE: Updated XPS 18 BIOS to A06, won't charge in cradle
I've had this problem for a long time (not charging in the cradle), and just today decided to dig in.
I found that the gold connectors in the cradle were loose. So, I decided to investigate deeper.
All but two of the gold pins had separated from the circuit board, but there is a black plastic joiner that holds them in place, and so it could make momentary contact... and didn't appear to be completely broken. But, once I had the piece in hand, it was plainly clear.
With a steady hand, and some soldering skill, I was able to quickly and easily clean and reattach the pins to the circuit board, and voila, all is well once again.
Previously, it would charge on the cradle sometimes... and only after 10 minutes of fiddling with the position of the tablet in the dock....
If your tablet isn't behaving in this way, then that may not be the issue for you.. However, it worked like a charm for me.