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!
Debut Radio Show Tuesdays from 1-2-ish p.m. EST on Hamiltonradio.net The Mechanical Animals
call in for car repair help! 609-503-4058
A recent set--NSFW audio: https://youtu.be/_dcxcZfD6dg
Mangofy your E46!