I have 3 black n decker 12v drills (had one before I married, my husband had one already and we have a swivel head one too). I have a brand new battery (bought yesterday) as well as 3 older batteries. I have 3 chargers total and Not one of them will charge the batteries (new or old ones) adequately enough to drill even one hole in my cabinet. I have even tried charging them overnight. Two chargers are the type that plug into the drill itself when the battery is attached. The other charger is separate from the drill and holds a single battery pack. The separate charging pack has a red light on it but it does not light up. I have plugged them into multiple different a/c outlets.

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