Question about Dewalt DC920KA Heavy Duty Xrp 18V Cordless Drill/Driver
Neither of my batteries will charge t get the blinking twice error code for bad power
Posted by Anonymous on
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.
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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Posted on Jan 02, 2017
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
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
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
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