I have two 3s 2200mAh lipos that have ended their life early. One has a cell that is puffed and appears non existent, and the other has a cell that discharged itself to 0v without use. The other two cells in each battery appear to be fine and stable. I was wondering if it would be a good idea to take the good cells and make a 4s 2200mAh pack. One issue is that one's a Turnigy 30-40c and the other is a Zippy 40C. Is this a difficult/dangerous task or should I try for 2 2s 2200mAh packs instead, or just toss them? They've been bad for probably over 8 months so I know their stable in their condition. Thanks!