Ni-Cad batteries are old technology and it's best to replace your Ni-Cad tools with ones that use Ni-MH or Li-ion batteries. But there's no secret to reviving Ni-Cad batteries, plans for battery zappers have been available for decades. Like mmidlam says, they use a very large capacitor to burn out short circuits in the cell. I wouldn't recommend trying to do it with a car battery; the capacitor will send a very brief pulse of current through the Ni-Cad cell, just enough to blow the short but not enough to damage the cell.
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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