I've found that my cigarette lighter adapter doesn't seem to charge or maintain the battery charge properly on my iPAQ when using my bluetooth GPS receiver. I've confirmed that when I plug in the iPAQ to the car charger, it shows as "charging", but when I used my GPS today, after about 1 hour of use, the battery had drained down to 80% (from 100% starting point), even though the battery indicator still says "charging". Has anyone else found this problem with their unit? I also have 12V DC inverter and I might try that next time I use my GPS. I suspect that the 5A output from the cigarette lighter adapter somehow isn't enough to maintain or increase the battery level while using my iPAQ with bluetooth turned on and backlight turned high? This is pretty lame as it means I won't be able use my iPAQ for extended GPS use, as the car charger is pretty much useless.