I purchased the first edition ipod nano about 2 or 3 years ago, whenever it first came out. Soon after, i bought a itrip car charger. The salesman at the store told me that i should be careful with car chargers because it ruins the ipods battery. It sends pulse charges instead of a consistent charge like from a wall charger. Well after a couple years, i can tell my ipod battery has been seriously affected. I left it in a decent amount of time with a full charge. Will my iPhone batter be ok as long as i take it out after a full charge?