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Can you please advise the voltage and current output of the plug pack used to charge the batteries of a Digitor Cordless Drill model T4818. I've found one at work and can use it although the plug pack has gone walkabout...

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The drill is 18V but the charger takes 24VDC and around 800mA.
Trial and error always works.

Posted on Oct 23, 2008

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I think the voltage is 18V. I'm not sure on the current. I would just call the company and ask them


Posted on Oct 21, 2008

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1 Answer

I need to know what the output needs to be on the charger of an 18 volt jobmate cordless drill.


During the initial state of the charge, the charger operates in a fixed-current mode. This means that the current will be held at a constant rate until the battery is charged to a bit over 18 Volts. During this phase, the output of the charger will not be 18 Volts. This is done for safety and battery preservation; forcing 18 Volts on a battery discharged down to 15 Volts or less could cause the battery to overheat. If no battery is connected, the charge controller may hold the output low until a battery insertion is detected.

The exact behavior of the charger depends on the chemistry for which it is designed, whether Nickel-Cadmium, Nickel-Metal Hydride, or Lithium ion. If the output of a known-good battery is 18 Volts after charging, and it has normal capacity, the charger is working properly.

However, a bad cell in the battery changes things. If you run a Ni-Cd battery down too far, the weakest cell in the battery may begin to reverse charge from the current coming from the other cells. This usually causes an internal short circuit, and the cell will be stuck at 0 Volts. A battery pack with one shorted cell will read 16.7 -16.9 Volts when fully charged, and the drill will not have the peak power it should. The charger will give you a battery fault indication if it is equipped to do so.

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1 Answer

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you'll need the model number to find parts that will work with it. Here's one, but I have no idea if it'll work for your drill: http://www.rakuten.com/prod/12v-nicd-battery-pack-for-hp1202m-and-sa120-ryobi-1311148/227915151.html

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Charger wont charge batteries for cordless drill


Check the charger output, it should be about 4-5 volts higher than the battery pack voltage rating. If the charger voltage output checks ok then the battery pack is defective. Any Radio Shack store can test the charger for you.

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1 Answer

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See if you can put a volt meter on the metal contacks of the charger to see what voltage it is producing. If you have a friend who has the same drill have him try to charge your batteries and then measure the battery voltage.

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You will to have your charging current/voltage checked in the first place., Use a multimeter and check the voltage of the adapter,. Next remove the drill unit and check the voltage on battery pack with the adapter and without. If there is increment of voltage on the battery then the charger seems to charge and your battery can be the suspect.
Change with the same AH rating.

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R86006 Li Ion 18v Cordless drill - When trigger is pressed, drill runs for a moment and stops. While charging battery, both the green and red lights blink permanently. Is battery and/or drill bad?


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Dewalt battery charger won't charge


As you know, solid red on your charger means that the battery is fully charged and the BLINKING red light means the battery is charging. Unless the light is blinking irradically everything is working the way it is supposed to. If the light is blinking irradically, the battery may just be too hot or too cold to charge ( like when you are driving many lags and your battery dies) and in this case simply wait 15 minutes to charge. If you get a fast blinking light still, the problem probably is with the battery.

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