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 - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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