Failed as a charger

I actually use the car charger, because I hear a lot of music in the car on my smartphone.
Regularly I drive a distance of 44km, often jam, so I'm always on the road for about 1 hour. When I connect the phone at this hour and hear music I lose 2-3%, already funny. And if I do just want to charge it creates few% charge only 1-2%. On my fire starter can not lie. Because I had an iphone and also for a car charger and since it was quite different.