Default [Q] Car charger

So what is the BEST car charger for the note 3?

I got a "samsung" car charger on ebay...dunno if its any good.

I plug the phone in at least say 40% and on the way home (30 min ride) seems like with real light use...the battery stays the same unless I am on calls then it actually goes down some.

So it seems like it doesnt quite charge the phone but it keeps it from draining.

any suggestions on a charger???

Thanks