Why is my car charger draining my battery?

[AC Question]

Car charger drains battery

I have a charger that goes into the cigarette lighter receptacle.
I was using my Razr HD phone today for GPS.
I note comes on my phone to unplug the charger so as to
not drain the battery.
That doesn't make sense, so I leave it plugged in and my battery
drains...........way down.
My friend hooked up her Galaxy phone and it charged up.
How come my phone is draining instead of charging?
Thanks

 

[lindakathy]

Re: Car charger drains battery

I'd like to add that I was using WAZE when the battery was draining while
plugged into my car charger.