![]() So do the computers managing your transmission, the sensors tracking oxygen intake and hundreds of other control modules. All the onboard electronics, from your AC to the little lights on your roll-up windows, run on the alternator. Yes, the alternator does charge the battery - if you’re driving at highway speeds. Yes, you can charge a car battery from driving. Recharge your car battery fast with this 4-amp smart charger, with charging options for AGM, EFB and lithium-polymer batteries.īarron affirmed that the myth is half-true. Protect your car battery with the Interstate ® Guardian™ 4 “There is no way your battery will get to 100 percent while you’re driving.” Your alternator is not a battery charger,” he said. “You would need to drive for a long time to charge a car battery. Interstate lab manager and decades-long expert on all things batteries and cars, Barron manages quality at Interstate and hosts ProClinic ® seminars for automotive shop owners and technicians across the country. Interstate Batteries auto electronics expert, Jeff Barron, knows the real answer. They might have even been somewhat true back to the 1950s car culture. If you look it up, you might see “Drive 30 minutes after you jump a car to recharge the battery.” Versions of this myth have been passed down for generations. However, it will never reach 100 percent while you’re driving. How long does it take to charge a car battery from driving?Ībout four to eight hours at highway speeds is what it takes to actually charge a car battery. ![]() If the battery’s dead, I just have to drive long enough for the alternator to recharge it.” ![]() You might have had this thought: “The battery starts the car.
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