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
While the car is running, some of the energy it produces is put through an alternator, which in turn charges the battery while the battery is being used for the headlights. If the car is using the battery without running or burning gas for fuel, the battery will drain because no energy can run through the alternator to charge the battery again
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