I have a Motorola Droid. My old car had a cassette player so I used a cassette adapter for audio and could charge the Droid from the "cigarette lighter". I just switched to a car with a CD player. All the FM transmitters I find plug into (use up) the cigarette lighter so I can't also power the Droid in the car but the navigator eats battery so I can't go on a long trip without plugging the Droid in. Can anyone recommend an FM transmitter that let's me still charge the Droid in the car?