Q: Battery warning popped up for Hyundai Accent 200

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I have a 2008 Accent, The battery warning kept coming on while driving and replaced a new battery but warning popped up again? I turned on the heater and the rear defroster on. Once the warning light came on, now even if the rear defroster is not on my battery warning light comes on. Sometimes when the warning light is on the rear defroster does not work. What could it be?

My car has an automatic transmission.

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while the engine turns the alternator. The voltage regulator is a unit that regulates the charging of the battery by the alternator and maintaining a certain amperage while the engine runs. When the alternator is not working properly, this may result in the battery quickly losing charge and the car losing all power as you have described. You may also notice a whining sound as a result of the bearings inside the alternator begin to fail. I would recommend having an expert from YourMechanic come to your location to diagnose and inspect your charging system.

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