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Charger adapter and battery get warm but charger light won't come on. Batteries don't charge any more. Are there supposed to be 2 or 3 charger contacts in the charger? Mine only has 2 but the batteries have 3.

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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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Offhand I am not sure what the voltage / capacity or voltage / charge rating of the battery and charger are but you can determine that by examine the labels on both items. Let’s say (for example) that your battery is listed as 7.2 volts and 1,000 mAH and your charger is rated as 9 volts and 100 mA. (These are just theoretical examples. Substitute the numbers from your own items.) You would divide 1,000 mAH by 100 mA to equal 10 hours. Then add 10%. So you expect a full charge to take around 11 hours time.

Of course, actual charge time will vary depending on how discharged the batteries are when you start charging them. Since the charger that Motorola provided doesn't have a charge indicator determining when the batteries are done charging is a matter of making an educated guess. If you touch the batteries while they are charging and they feel warm to the touch, that's a pretty good indication that they are done or nearly done charging as once the batteries are topped off excess power will turn into heat. (Note that batteries in a charger should never be HOT. If they are ever more then just slightly warm, something is wrong with the battery or the charger or both.)

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