UA uses Empower. I don't believe they have 110v outlets at the seat. If the USB charger works (I have one as well, I use it with the tip adapter that came with the E61) that should do the trick along with an EmPower/Cig lighter adapter and a cig lighter/USB adapter. Still seems like a LOT of trouble to watch video. Also, you might try it and see if the battery will hold up on it's own. It lasts a LOOONG time and video watching uses a lot less power than talking.