Be kind to your battery.

If you inadvertently leave your lights on and drain your battery, take the following precautions to prevent damage to the battery and the starter when jump-starting your car:

Don’t risk causing the battery to explode.

With both cars off, connect a positive cable end to the positive battery terminal of the dead battery.

Connect the other positive cable end to the positive terminal of the source battery.

Connect a negative cable end to the negative terminal of the source battery.

Attach the remaining negative cable to unpainted metal on the car engine (as far from the dead battery as possible).