Hand holding two corroded copper battery cable ends over a batte…

As bad as this looks, it CAN be cleaned & repaired without losing much of the cables' length. The wire can be untwisted & brushed to release the corrosion & then cleaned down to the good copper. Any remaining corrosion will be sealed inside the solder, so without water or oxygen, it can't do any more damage.

Owner caption February 2011 · Photo 3477 of 6546