Rick's Free Auto Repair Advice

Posts Tagged: recharge battery

How long to leave a car running to recharge battery

How long to leave a car running to recharge battery? How long does it take to recharge a battery with a charger? If you’ve got a dead car battery and you’re wondering how long to leave your car running to recharge the battery, hear this; it’s much longer than you think. Here’s why. At idle speeds, your car’s alternator outputs less than 1/3 its maximum capacity. Plus, in late model cars with power management systems, the computer controls the charging rate, so it’ll only recharge the battery at safe rate. … Read More


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