I also have the Boxwave miniSync retractable sync and charge cable. Even though I love the design of this thing, the power dongle leaves a lot to be desired. I think boxwave messed up because the power dongle doesn't fit the jack on N800. It feels loose. You have to play with it a little before it connects and starts providing juice. I've emailed boxwave and they offered to exchange it for me. Don't know if the new one has a better fit. Will keep you posted.