Does Leaving Your Car On Drain The Battery. That means that a current of one apere will drain out the battery in 72 hours. What may drain a car battery when its off are things such as interior lights door lights or even bad relays.
A lot of people worry that listening to the radio in the car with the engine turned off could drain the battery. Forgetting to turn off a cars headlights after shutting down the vehicle is fairly common but this kind of forgetfulness can prove troublesome. Or a current of 72 Amperes will drain the battery in one hour.
How much current do you draw if you leave your lights on.
If you left the lights on overnight in your car or if you were powering some appliances with your car battery it might cross your mind as to whether or not draining a car battery will damage it. This is why they say in the manual to never leave the car in accessory mode for a long period of time but rather leave the car in D and not in N to allow the car to use the engine to charge the high voltage battery that can charge also the 12V. The problem generally is not the door or the trunk lid itself but rather the interior lights that will continue to burn as long as the door or trunk remain open. One of the most important effects of idling to keep in mind is carbon monoxide poisoning.
