Be sure to drive your car for about 30 minutes before stopping again so the battery can continue to charge.

Do car batteries charge while idling?

The answer is YES, yes the car battery does charge while the engine is idling. As long as the mechanical action of the alternator is taking place; that is, being turned by the engine crankshaft. Then the alternator is producing AC current, thereby charging the battery while your car is idling.

How long should I run my car after battery dies?

The dead battery is needed to start the car. If it starts, leave it idling for at least 20 minutes or drive for five miles to replenish the battery.

Can you take jumper cables off while the car is running?

Once the dead car is running, you may disconnect the jumper cables, starting with the black, negative cable clamps. Do not let the clamps touch each other while any part of the cables is still attached to a car.

Can you jump a car without the other car running?

Have the driver of the vehicle with the good battery turn their engine on and allow it to idle for a few minutes. Leaving the other car running for a short time will allow your dead battery to recharge before you attempt to start your engine.

How long will it take for a bad alternator to drain a new battery?

In this situation, the battery could last as little as 30 minutes. If you are lucky and could get up to two hours. Note: In case you have to start the car without an alternator, dont turn off the engine once youre going. Starting the car flattens the battery down quickly.