Question about Dewalt 7.2-18.0 Volt One Hour Charger

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My DeWault charger DE9107 does not charge battery pack.Output voltage is 0

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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SOURCE: dewalt charger

Measure the output voltage, if it is low then you must replace the charger, they don't sell parts to repair them.

Posted on Sep 02, 2008

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SOURCE: not charging

try wiggling the battery around and see if a light flashes

also look and see if a light flashes when you plug it in

i'm about 98% sure it's the charger

Posted on Oct 20, 2009

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SOURCE: dewalt charger

Same Issue, the above is not an answer.
What causes the "power issue" to flash. "power line" "powerline"
It isn't the power the power is fine, tried in multiple plugs.
Are the batteries unable to be charged,
Is it just a case of toss the charger.

I gave it to someone to use out in the sticks and suspect it is something to do with fried from not using a quality regulator off a generator.

Posted on Sep 28, 2015

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I have repacked my AEG 12 volt Li Ion battery but it will not take a charge could one of the electronic components have open circuit?

First thing to do would be to check the voltage output of the charger to ascertain if it is working properly. The voltage out of the charger should be higher than the battery pack voltage. Next (if you have the instruments) check to see if current going through the battery pack. If you have no current flow and still have the correct voltage then one of your cells is either faulty or the pack has open circuit wiring or has been repacked incorrectly.

Sep 27, 2017 | Drills


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on Sep 21, 2010 | Cameras

1 Answer

How do I repair the charger portion of the unit without replacing the entire unit

No make and model # makes answering difficult so I'll have to give very general information. Also I'm assuming this is well out of warranty - otherwise call the manufacturer first. Now, when we start without any schematic we trace backwards from where we know the circuit should end. In this case you start at the battery terminals since you're trying to find the charging circuit. It is more difficult today since if there's a microprocessor in the mix it could be controlling when a given line is active, when the charging line is connected to the battery, or not. The charging circuit will be a constant-voltage circuit for Li-Ion batteries ~ 3.7 Volts depending on the battery. If it is Lead-Acid it will probably be 13.8 - 14.0 volts, if Ni-Cd or Ni-MHd then it depends on the size of the battery pack and again will probably be a max voltage of about 1.25V/cell * Number-cells. Once you find the circuit you can test to see if there is any output voltage and current when it is "on" - if it never turns on then the problem is either the circuit is dead or the CPU is not turning it on - if the CPU controls this. If you can find the line from the CPU to the charging circuit see if it ever changes state, if not you could try "forcing" a different state, ie, it the state is always off (usually a 0 Voltage) then try finding the voltage line to the CPU and place that voltage on the CPU to Charger circuit line. If the line is always high (anything from 3.3 V to probably 5V depending on the CPU's power requirement) then try lowering the voltage to a 0 state. This is much more difficult since it may require cutting the line from the CPU to the charger. If either of these gets the charger to work then the problem is with the CPU, if nothing gets the charger to work the problem is the charger.

Nov 19, 2014 | Boating

1 Answer

Ic-v85 battery wont charge

battery pack already exhausted or your charger is defective, check your charger by using voltmeter, if there is voltage output more than your battery voltage that means your battery needs replacement.

Apr 23, 2013 | ICOM Informatique Radio Communications

1 Answer

Go-go battery won't charge

PLEASE NOTE: The Low Voltage Protection feature on this battery charger will not allow the charger to activate unless it is connected to a battery pack that has a minimum voltage of 16 volts. Battery packs with voltages below that level of charge cannot be recovered or recharged. This is a safety feature to prevent overheating in the event of a faulty battery. This battery charger will not output any voltage to the XLR connector until connected to a battery pack meeting this minimum voltage requirement.

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1 Answer

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.

Nov 07, 2011 | Drills

1 Answer

Wont charge

Probably the battery pack is worn out or has a "memory" problem. A worn out pack will have one or more cells shorted internally (one or more cells read 0 Volts, and an ohmmeter reads less than 1 Ohm when connected to the 0 Volt cell). If it is a memory problem, it is possible to recondition it, but not simple. You have to remove the pack, then connect a 150 Ohm resistor across each cell and let the battery sit until the cells are completely discharged. You can't just connect a resistor across the entire battery pack because the stronger cells will reverse-charge the weaker ones, which will cause them to short out.

Running the battery too far down will cause the reverse-charge problem, but not running it down at least occasionally will cause the memory problem. (Memory problem explained: the cadmium crystals grow when the battery is charged and shrink as it is discharged. However, the larger ones tend to remain intact on discharge and grow faster than the smaller ones. Eventually they block the ion flow through the battery, so the battery loses capacity. It's called a memory effect because the battery only "remembers" it has the capacity to go down as far as it is habitually used. Running the cell all the way down dissolves the over-sized crystals.)

It is possible you have a problem with the charger. Check for voltage on the charger plug. It should be about the rated output voltage printed on the charger box before messing with the battery.

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2 Answers

Dirt devil doesn[t hold charge

Try running the battery all the way down by letting the vacume run in a corner or another room and even when it stops leave it on for a hour to drain the battery. Then shut the switch off and try charging the battery. Make sure the charger is putting out enough volts by looking at the rated output of the charger and while it is plugged in check it with a volt meter. If it does not hold a charge and the charger is putting out the right voltage you need to purchase a new battery for the vacume

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Dewalt charger

Measure the output voltage, if it is low then you must replace the charger, they don't sell parts to repair them.

Aug 27, 2008 | Dewalt 7.2-18.0 Volt One Hour Charger

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