I have no experience with Black and Decker batteries, but have had DeWalt batteries do that. I would take the bad battery and place a penny in each of the power terminals. See pics. Take the good battery and make SURE to connect (+) to (+) and (-) to (-). Connect only for several seconds. Place bad battery on the charger immediately. I have revived several batteries in this manner. Please use caution when using this procedure. As a precaution make sure to do this outside in case of fire.
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