Going to read back beecause I'm not sure where this discussion came from, but in our car we have a charger/transmitter combined so my husband automatically plugs in our phone to charge and listen to podcasts, music,etc through our stereo system, even for short drives.
We also both plug our phones in at night, every night i use mine as an alarm, he does not.
Also: if I have charged it the night before, it will last quite a while. And it is a blackbrry, but that is only if i stay in the city, and am not listening to music,etc. if i just use the nomal phone fuctions it will last a few days.