testafoto

Hi, I'm new to the forum and hope I'm in the right discussion group. Anyway I have a DW9072 Battery that's been sitting in the charger for awhile. One day it emitted a high-pitched whine the LED starts flasing the "bad pack" sequence. I took it out and put it back in weeks later. Same thing. Could the battery be no good, just die one day? Was it being overcharged? Could it be the charger? I want to replace it but I want to buy the right component. Thanks for your help.