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Old 03-07-2011, 03:00 PM   #1
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troubleshooting drill charger


I have a cordless drill. It has 14v nicd batteries.

I was using the drill and it was working fine. I put in the fresh battery off the charger, and nothing. I charged the other battery, but it didn't charge (drill still turned with the little juice it had from before. So I think the charger is not working.

It's a slow charger. It has a 19v DC power supply. A little red LED lights up when it's plugged in and a battery is inserted, and it lights. The power supply gets warm.

Any ideas for what to check?

It's kinda sorta like this one (about 10 years old)

http://www.mindspring.com/~cquade/pi...lessDrill1.jpg

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Old 03-07-2011, 03:27 PM   #2
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troubleshooting drill charger


I've never had occasion to do it before, but under the circumstances that you described, I would probe the contacts in the charger, to see what that might reveal.

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Old 03-08-2011, 06:24 AM   #3
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troubleshooting drill charger


The probes read 14.4 volts, which seems reasonable. When I put a battery in, the voltage reading drops to the voltage of the battery (5.4). The inside of the charger has a circuit board with two small resisters and what seems to be one large resistor. It has an insulating braid over it, so I can only see the end.
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Old 03-08-2011, 10:13 AM   #4
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troubleshooting drill charger


Buy a new charger once you are certain the batteries are good.
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Old 03-08-2011, 01:14 PM   #5
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troubleshooting drill charger


Quote:
Originally Posted by J. V. View Post
Buy a new charger once you are certain the batteries are good.
The one battery was working fine the other day until it ran down, so I'm reasonably confident about that. It looks like sears sells the charger for $13. I hadn't thought about the possibility of buying one until you mentioned it.

Thanks

For $13 I'm not going to spend any more time trying to figure it out (especially since I have a better cordless drill that I use for most tasks).
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