Samsung Moment or the new Blackberry? so not sure
I don't know the answer about the car charger issue, but I don't see why it would be a problem.
Here a few Android based websites, there are forums there also.
Check out the forums at these sites.
Lion batteries are difficult to "determine" level of charge above 90%
SO you charge in 1 of 2 ways.
#1 you charge and after a little bit you determine charge level and either continue charging or STOP charging.
#2 if charge level is over 90% you apply NO charge until it drops below 90% and then you charge to full.
Most car chargers are method #1 since #2 is far more expensive and more difficult.
SO consider what happens when you plus a 100% full battery into one of these chargers.
it begins to CHARGE an already charged battery IE your over charging.
sure after a bit it will stop BUT consider this. your car charger resets EVERY time you turn you key of...