tl;dr...there's the glovebox flashlight-cigarette lighter device...all of $10. Plug usb into that.
That's been covered already I presume, but again...tl;dr!
Upcoming comedy shows: March 3 at Broadway Comedy Club, NYC, 8 p.m. March 5, Tierney's Tavern, Montclair, NJ, 7:30 p.m. See Facebook for other shows and PM me if you can make one...love to see you there!
Mangofy your E46!