is it ok to charge your new iphone for the first time by car cjarger

Sure you can use the car charging port. Also, it will never hurt your phone to charge it all night long. Your phone is designed to stop charging once the battery is fully charged. And you can charge your phone at any time or at the same time, such as every night while you sleep.

If the charger is certified for iPhone or iPad usage (meaning it outputs the required voltage/current levels of low-noise power), it is just the same as plugging onto a computer or using the wall wart. Note also that fully discharging any modern (meaning Lithium-battery-powered) rechargeable represents extra wear and tear on the battery, which on the long run can translate to a shorter usable lifetime of the battery, the point at which runtimes drop to unacceptable.

While the automobile charging port may or may not be active when stationary

with the ignition key in the 'off' position, otherwise depending on how long

your vehicle is running, the charger should do just fine. It would not overcharge.

But my concern is that if you had to leave the iPhone attached (and concealed

from passerby view, as theft deterrent) that interruptions to iphone in-car charge

adapter may cause a significant lag in time it could take to fully charge a phone.

Some vehicles have a hot accessory port that may not see interruption should

the ignition keyswitch be turned to 'off' or not left on accessory. Years ago I

had installed a second 'cigarette lighter port' (as a non-smoker) so power could

be available in my vehicle cabin with ignition key removed.

Good luck & happy trails! 🙂

I charge my iPhone 5s and iPad Air 2 every single night when I get home from work and have done so since day one with all of my iOS devices.