Question about Dewalt 7.2-18.0 Volt One Hour Charger

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Output voltage How do I measure the output voltage? Thanks mate

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For his charger the output volatge is 36v to 52 volts dc.

Posted on Sep 19, 2008

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Set your multimeter to highest dc volt. All chargers have output voltage information written on it (Must be written as "output" value or "sec"). Measure charger's output pins (which connects to battery) and be sure measured value matches with output voltage value written on charger label. If it doesn't match each other, buy a new charger and proceed with below part.

Discharge your battery. Once you discharge battery; be sure that there is no charge at all. Charge battery for 15 min. Measure battery power with multimeter again. If there is no charge at your battery, it is dead and you need another battery.

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If you have the skill to determine the transformer input is open, I would expect you have the skill to replace a transformer. Based on this assumption: determine the input voltage (120 vac?), determine the output voltage (14 vac?), determine the power requirements (output voltage times the charging current), find a transformer at www.digikey.com or www.mouser.com or www.newark.com.

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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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I HAVE DEWALT CHARGER DE9116.ITS OUT PUT VOLTAGE WITH OUT LOAD IS 51 VOLT.AND WITH LOAD IS 15 VOLT.THE BAATERIES BECOME VERY HOT WHILE CHARGING


check output voltage on charger label most chargers are not regulated so if it says 18 volt output it may put out 24 volts but if its putting out 51 volts it may have a short batteries will get warm but not hot replace charger

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2 Answers

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Powaforce battery charger.

  1. Measure the dc output (with multimeter) on female plug. Should read ±16 – 20V DC. If no voltage here open charger and measure 220v AC on input wire before transformer. No voltage faulty input cable or 3pin plug. If ok check for dc voltage after transformer. If transformer faulty (not worth repairing) replace with same dc volts and amp (important)output. Check now output cable.
  2. If voltage is on cable but base does not light up, probable faulty capacitor. If light is on but does not charge, probable rectifier that gives too little amps.
  3. Any good tv repair technician can help you. My tv tech already fix about 9 of my torch and drill chargers. Parts usually about R5 – R10.
ps. email me the specs of your charger the input, output, the current (MA) and the voltage 14.v or 21v to globalsat1@gmail.com

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1 Answer

I require a step down plug


I'm disappointed that Dewalt does not have the full specs on their website so . . .
Check the specifications on the charger's label; they should read something like 120 VAC or Volts AC and 2.0 (or similar) amperes or just 'A' after a numerical value.
If the label does not give you an amperage value you can use the output value instead and substitute the output voltage at the high end if a range is listed.
To get the adaptor (step-down transformer) wattage, multiply the AC values such as:
120 X 2=240 watts input power.
If these AC values are not available;
Take the high end charge voltage if it is a multirange charger, and multiply those values;
One we own DW9108 (- yours is 7.2 - 18) is spec'd at 9.6 to 18 volts and 2.8 amperes:
2.8 X 18=50.4 watts.
You can see that the values do not correspond but it is a multirange device so the maximum current taken from the AC line can be ~ 2.0 amperes but this is charging a specific pack and the peak input current is only momentary so the maximum output current and voltage are the values one should use as a guide. In other words, the output wattage is closer to the value needed.
Since there are losses in any transformation (mostly heat), the required stepdown transformer must be capable of more than the indicated 50 watts.
A safe factor would be 1.5 X 50 (W) or ~ 75 watts minimum to ensure the charger receives the 120 volts it wants.      
Anything that will step down your (?) 220 volts and is rated at 75 watts or more will do the job even if the Dewalt draws a little more current at your line frequency of 50Hz which it may.

Oct 09, 2008 | Dewalt 7.2-18.0 Volt One Hour Charger

2 Answers

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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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