Mine has a red yellow and green light across the top and in the shape of a small battery. This is to ley you know you know the condition of the battery. Red is needing charge,yellow is to let you know caution and the green is full charge. And none should be lit unless you press the check battery button. I hope this helps answer your question!!!!
If you pay for the shipping, you can have mine for free. I'm going to throw it out with the unit anyway. Email me at email@example.com if interested. If not, I suggest you try the Black & Decker website.