Dewalt Battery Charger Output Voltage

[Chris F.]

Someone brought me a Dewalt cordless 14.4V drill that was totally dead.
I've determined that the drill works and the battery is faulty, but am
uncertain about the charger. The output of the charger measures about 47
volts - that seems way too high, but I thought perhaps it was designed this
way to provide a rapid charge. Is that the case, or has the charger (a
switching power supply type) gone out of regulation and ruined the battery?
Thanks for any help.

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[Dave Plowman (News)]

In article <D2Kzg.31729$pu3.4...@ursa-nb00s0.nbnet.nb.ca>,

Chris F. <zappyma...@hotmail.com> wrote:
> Someone brought me a Dewalt cordless 14.4V drill that was totally
> dead. I've determined that the drill works and the battery is faulty,
> but am uncertain about the charger. The output of the charger measures
> about 47 volts - that seems way too high, but I thought perhaps it was
> designed this way to provide a rapid charge. Is that the case, or has
> the charger (a switching power supply type) gone out of regulation and
> ruined the battery?
> Thanks for any help.

Open circuit voltages are rarely a guide to anything. The internal
resistance of Ni-Cads, etc, is extremely low, and a genuine 47 volts
across a 14.4 pack would blow it into the middle of next week.

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Dave Plowman da...@davenoise.co.uk London SW
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[GregS]

In article <4e4fa0f...@davenoise.co.uk>, "Dave Plowman (News)" <da...@davenoise.co.uk> wrote:
>In article <D2Kzg.31729$pu3.4...@ursa-nb00s0.nbnet.nb.ca>,
> Chris F. <zappyma...@hotmail.com> wrote:
>> Someone brought me a Dewalt cordless 14.4V drill that was totally
>> dead. I've determined that the drill works and the battery is faulty,
>> but am uncertain about the charger. The output of the charger measures
>> about 47 volts - that seems way too high, but I thought perhaps it was
>> designed this way to provide a rapid charge. Is that the case, or has
>> the charger (a switching power supply type) gone out of regulation and
>> ruined the battery?
>> Thanks for any help.
>
>Open circuit voltages are rarely a guide to anything. The internal
>resistance of Ni-Cads, etc, is extremely low, and a genuine 47 volts
>across a 14.4 pack would blow it into the middle of next week.
>

It should be easy to connect some resistors and measure the chargers
capabilities.

greg

[James Thompson]

"Chris F." <zappyma...@hotmail.com> wrote in message
news:D2Kzg.31729$pu3.4...@ursa-nb00s0.nbnet.nb.ca...

I believe that type of charger is more current pulse width controlled then
voltage. get a 10 ohm 10 watt resistor as a load with a current meter is
series and see what it puts out current wise. If you have another meter
handy measure the voltage across the resistor and that should tell is the
charger is working ok.
I also have 2 of those dewalt chargers and they do put out a higher voltage
then you would expect, as like you stated for rapid charge batteries.

[Alex Shabi]

A voltage output of 47 volts from a charger that is supposed to charge a 14.4V battery is definitely not normal and indicates a potential issue with the charger. The charger for a 14.4V Dewalt cordless drill should provide an output close to the rated voltage of the battery, typically around 14-15 volts.

Here are a few things to consider:

Charger Regulation Issue: The charger may indeed be out of regulation, and this could be causing the excessively high voltage output. If the charger is not regulating the voltage properly, it could have damaged the battery.

Battery Damage: The high voltage from the charger could have damaged the battery. Lithium-ion batteries, like those used in cordless drills, can be sensitive to overvoltage conditions.

Faulty Charger: The charger itself may be faulty, and its internal components may need inspection or replacement.

In any case, using a charger with a significantly higher voltage than the battery's rating is not safe and could lead to further damage. I would strongly recommend against using this charger to charge the battery until the issue is resolved.

Here's what you can do:

Check the Charger Manual: Look for the charger's manual or specifications to confirm the correct output voltage. If it specifies a much lower voltage, the charger is likely faulty.

Contact Dewalt Support: Reach out to Dewalt's customer support or service center with the charger model and details. They can provide guidance on whether the voltage you measured is within the acceptable range.

Consider Replacement: If the charger is indeed faulty and has damaged the battery, you may need to replace both the charger and the battery. Using a proper and compatible charger is crucial for the longevity and safety of your cordless drill and its batteries.

In summary, a 47V output from a 14.4V charger is not normal and could indicate a problem. It's recommended to consult with Dewalt support or a professional technician for further guidance and to ensure the safety and functionality of your cordless drill. Answer Copied from https://iceagetools.com/hot-cold-delay-on-dewalt-charger/

[Peter W.]

From 2006.