Question about Dewalt DC920KA Heavy Duty Xrp 18V Cordless Drill/Driver

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Why does battery charger blink twice no matter where its plugged in?

Neither of my batteries will charge t get the blinking twice error code for bad power

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You may have a failing capacitor on the secondary side of charger power supply circuitry. The output voltage will be low or have a lot of ripple; this would cause the error detected. Pictured below is a bad electrolytic capacitor next to several good ones (this is not from a battery charger). Notice how the top is bulged upward instead of being flat - it indicates pressure caused by the capacitor burning out.

why does battery charger blink twice no matter whe - ae38ee76-6dc4-4808-8a4b-afe8be8c00cd.jpeg
There are other failures that could cause this error code, but this one is highly probable.

Posted on Aug 21, 2014

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

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Posted on Jan 02, 2017

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jcameo7270

Jeffrey Cameo

  • 675 Answers

SOURCE: When I plug in my

The batteries are probably bad...especially if you kept them outside in the cold or at some point they got frozen...also, if you don't use them for a long period they will exhibit this behavior..get new batteries

Posted on Dec 22, 2010

wfay

  • 13 Answers

SOURCE: charger blinks twice red and then breaks and twice

There should be a diagram on the front right hand side of the charger that tells what each flash rate means.

Posted on Nov 27, 2009

tcraignfam

Tyler Craig

  • 30 Answers

SOURCE: 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.

Posted on Dec 12, 2009

raysaw

  • 267 Answers

SOURCE: I HAVE A 36 VOLT DEWALT RECIP SAW, THE BATTERIES

Charger blinks while charging, stops when batteries are fully charged.
New batteries may not be charged from factory. Let them charge overnite and see if it stops blinking.

Posted on Feb 05, 2010

DAVID CAYCEDO

  • 94 Answers

SOURCE: light blinks and battery doesnt charge

battery is probably dead. it has been my exp.

Posted on Apr 21, 2010

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1 Answer

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First, clean your battery contacts on the radio, battery and charger with a pencil eraser. Try again to charge the battery. (Be certain the radio is turned off while on the charger.)
If this does not solve the problem, try a known good battery from another radio and see if swapping batteries solves the problem. If so, replace your batteries.
If the charger blinks no matter which radio you place on the charger, you may have a problem with one of the charge contacts in the charging tray itself. Once again, process of elimination will determine which one is the culprit. Then replace the bad charger.
The batteries will have a 2 year life expectancy, and there is a date code on the battery. It is either a 3- or 4-digit number. First number of a 3-digit code is the year, followed by the week of the year. Example 324 would be 2013 the 24th week. Four digit codes are similar except the first two numbers are the year, example 1324 would be 2013 the 24th week.
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1 Answer

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I don't know that I have your solution, but I do have a few troubleshooting tips.

Flashing typically means: your battery is possibly old, bad or is not making good contact. Clean your battery contacts with a pencil eraser to ensure they are making good contact with the charger. Also check your charger contact to see that they are free of debris. They can also be carefully cleaned with an eraser. (Do not use any type of solvents on either contacts.)

Second, check the date code on your battery. It is 3 or 4 digit number on the label. Batteries last approx. 18-24 months before starting to fail. Here is how to read the code: 835 would be 2008 the 35th week. If the battery is more than 2 years old, you should consider replacing it.

It is wise to have your radio turned off while on the charger. You can cause harm to the radio if you inadvertently press the PTT while the radio is on the charger. Plus, your radio will never fully charge if left on.

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