Rick's Free Auto Repair Advice

Posts Tagged: how long to leave a car running to charge battery

How long to recharge your car battery?

How long to recharge your car battery by idling versus driving? First, it’s never a good idea to recharge a dead battery by idling Your alternator is designed to top off your battery. It’s not designed to recharge a completely dead battery, especially at idle speed. Trying to recharge a completely dead battery by idling is a great way to overheat your alternator and kill it. Keep in mind that a battery charges costs around $70, while a replacement alternator costs around $500 to as much as $1,000 with installation. … Read More


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