Q: How long do you have to go away a battery charger in a car? A: While more recent, more technologically State-of-the-art car battery chargers give an abundance of built-in protection features meant to stop overcharging, it’s not a good idea to go away the charger on your vehicle constantly. https://medium.com/@IndustrialToolsSupplier/supplier-for-automotive-battery-chargers-and-power-tools-7d2bd01049d9