Why is the 2011 ford escape battery light on?

The 2011 Ford Escape battery light comes on due to a bad battery or alternator. The cause of the battery light could be a loose or corroded battery cable or other wire connecting components of the charging system, or it might be a problem with the alternator or voltage regulator. The alternator generates the power that is stored in the battery.Driving with Your Battery Light on is not a good idea. If the battery is bad, the alternator is faulty, or the wiring is bad, these can cause the vehicle to lose power and not operate like it normally would. The battery powers essential parts of Your car, so it is a must have piece of equipment.