To ensure that the battery of your car does not run down when you don't use your car for some time, locate and unplug the connections in your car that drain the battery power, for instance - dash cams, etc. Ensure you don't turn on your car engine and immediately turn it off again. Anytime the engine of a car is turned on and immediately turned off without the intention of driving the car or allowing the engine to steam for a while, it could cause severe damage to your car battery. Another option would be to use a battery conditioner or a trickle car charger to help preserve the battery power of your car when you're not using your car.