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I just exchanged the cell package from Harbor Freight battery 68413 into the B&D 18 volt battery case. Soldering the wires was the most time consuming step of the swap. Batteries from HF only cost me $10.40 each using a 20% off coupon. Batteries were at 19.0 and 19.2 volts before using. I use these B&D string trimmer and leaf blower.