How to fix a craftsman 19.2 battery?

My 4 year old Daughter left my craftsman light 19.2 on all night. When i went to charge it, the charger said the battery was defective. The charger normally says charging or fully charged or defective. The battery may still be good... but I think it is deeply discharged making the charger think the battery is... show more My 4 year old Daughter left my craftsman light 19.2 on all night. When i went to charge it, the charger said the battery was defective.

The charger normally says charging or fully charged or defective.

The battery may still be good... but I think it is deeply discharged making the charger think the battery is defective.
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