You may need a battery but most of the time when the battery warning light comes on we find a bad alternator. The light is indicating that the battery is not being charged. As your car runs it’s using power from the battery, the alternator is there to keep a fully charged battery fully charged, it’s not there to charge a dead battery if you have a dead battery it should be checked and brought back to full charge with a proper battery charger. Your service center can advise you as to what action needs to be taken, you may need an alternator or perhaps it is the battery.
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