Question about Drills
This could be an indication of a bad cell in the pack. As nicad batteries get older they will sometimes short internally do to oxide buildup. If one or more cells are bad the pack as a whole will pull more current from the charger which in turn could cause it to heat up. Most newer chargers have 3 contacts. The 3rd contact is normally conected to a diode inside the pack. The chargers circuitry monitors the batteries temp by measuring the voltage drop on the diode.
Hopefully this may give some insite.
Posted on Nov 13, 2009
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Posted on Jan 02, 2017
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