Why can you drive all night with headlights on, but if you turn the car off and then turn them on, your battery dies by morning?
In: Technology
Your engine contains a part called an alternator – this is a small generator that makes electricity as the engine runs.
So when you are driving normally, the battery is needed to start the engine, but after that point the alternator is producing enough electricity to keep running the engine and also power the lights, radio, ac, etc and the battery does nothing.
When you turn off the engine, the battery now had to power everything, use too much power and the battery ribs flat and will no longer have enough power left to start the engine again.
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