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Car battery charger time8/7/2023 ![]() Your best bet is to just take your car for a spin instead of leaving it idling in your driveway. If your car is just sitting there idling, it's not generating a lot of RPMs, meaning it will take your battery much longer to recharge this way. Guess which component is responsible for powering these additional systems? That's right, it's your alternator. The reason for this is that modern cars have a lot of additional electronics that use up power. Do Car Batteries Charge While Idling?Ī car with an idling engine will still recharge your battery, but at a much lower rate than if you were driving. If your battery is severely discharged, it may take even longer to recharge it. Keep in mind that 30 minutes is an average. ![]() It takes most vehicles about 30 minutes of driving at highway speeds to fully recharge the battery. Faster speeds generate more RPMs, so your battery will recharge faster at speeds of 55 MPH or higher. You need a minimum of 1000 revolutions per minute (RPM) from your engine to generate the power needed to charge your battery. ![]() How Much Driving to Fully Charge a Battery? Once it drops down to 11.6 volts, the battery is almost completely discharged. For instance, a voltage of 12.1 volts means your battery is operating at only 50% of its total charge. When your battery's voltage drops even a small amount it can make a big difference in its overall performance. So, when the engine is off, a car battery is considered fully charged at 12.4 to 12.6 volts. A 12 volt car battery contains six cells, each of which will contain 2.1 volts of power when fully charged. ![]() Most modern vehicles have a 12 volt battery underneath the hood. How Many Volts in a Fully Charged Car Battery? So, how long do you need to drive your car to recharge the battery? Does your driving speed affect how fast your battery recharges? Keeping reading for answers to these and other commonly asked car battery questions. If you don't drive your vehicle long enough or often enough, your battery's charge will continue to get lower and lower each time you start the engine. One thing many people fail to realize is that recharging a battery takes time. Once that's accomplished, your vehicle's alternator works to recharge the battery while you drive. Car batteries provide the massive jolt of electricity needed to start your vehicle's engine. ![]()
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