Does Car Battery Charge When Driving. If you are driving on an open road and your engine RPM is. Yes your car battery will charge when the engine is idling.

Yes your car battery will charge while in park. Normally 4 amps is the common rate for car battery chargers. Whereas when you are driving the same car in a busy traffic scenario it can take up to 1 hour or more to charge the car battery.
However you wont get as much amps as you would.
Revolutions per minute RPM of your engine determine the duration of your battery charging. A home charging station is a better bet. As we said before the alternator will recharge the battery. If your car battery did not stay charged while you drove around this.
