im thinking of changing my headunit and maybe purchasing one with bluetooth. which would let me listen to music without a aux cable or ipod connection. but, does streaming my iphone music use up the phone's battery quickly?

 

I ran out of battery only once since I've gotten my bluetooth headunit, and the phone was already partially drained. The power consumption of bluetooth + pandora isn't particularly fast imo. Easily get several hours of it, which is in general far more than you'll need in most sittings.

And the head unit can charge/connect via a cable so in the event of battery loss... I just plug it in!

-Towels