Car charger for Note 3

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http://forums.androidcentral.com – I have a car charger (the charger has Input 12V - 24V, Output 5V 1A). When I plug the Note3 to the charger I see the small lightning icon inside the battery that tells me that the phone is charging. However, when the phone is on during the Map navigation, I can see that the battery still drains. Is it not possible to actually charge the phone using he car charger and it is normal for the battery still drain when the charger plugged in? Is there a charger that actually charges the phone in the car? What happens when the phone plugged in, but the battery ? (HowTos)