Title, why can we drive for hours and hours on end, with headlights, radio, a/c, etc. (besides stopping for gas, bathroom breaks) But when we leave a light on for as much as an hour, the car battery will pretty much die instantly.
In: Engineering
Your cars battery, for the most part is used to start the engine. Then your car runs off of the alternator, which also charges the battery. So. While your driving your not actually actively using your battery.
When your car sits and is not running the alternator is not in use. So your battery is what keeps things going, and since the alternator isn’t on to charge it up, it’s being depleted continuously which leads to the battery dieing.
As for how long it takes to deplete the battery, that’s dependant on the batteries capacity as well as it’s age and how well the battery had been taken care of
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