I'm trying to get replacement batteries for an old Black & Decker cordless beater type 3 3.6VDC catalog # 9210 with date code 8920T. The 3 batteries themselves have p/n 146527-00 8836. I need new batteries. Sears Parts Direct shows this battery pack as p/n 681905-01 but discontinued, of course. Batteries + Bulbs doesn't have anything.