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DeWalt dw935 saw the charger says fully charged but saw barley runs.

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The battery is defective.

Posted on Dec 15, 2016


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Posted on Jan 02, 2017


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Charger light blinks rapidly for dewalt charger?

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Radio will not charge a battery but it will run off a fully charged battery

There is a charger module in the radio that may be bad. The module is well over $100, so maybe charging the battery in a seperate charger is the way to go.

Go here:

Choose the type that you have (Type 1 or 2)

On the parts diagram, the charger module is #43.

Good luck from Detroit, MI.

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When do you know the battery is fully chaarged

on the charger there is a red LED that blinks while it is charging when it is fully charged it will not blink usually about 1 hour to charge a DeWalt 18v battery

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1 Answer

I have just brought a new dewalt dc390 cordless circular saw and it seems that the motor is running backwards?

It is possible that the motor is running backward but... first see the manual here: Make sure the blade is installed as pictured in figure 4 page 11 of the manual.
After seeing the manual..... make sure the battery is charged correctly. The flat side of the battery should be toward the back of the charger when charging. If somehow the battery was inserted backward in the charger it is possible the battery was reverse charged during the intital charge. If you suspect this has happened.... insert the battery in the saw and run the saw until the battery is DEAD. Then insert it properly in the charger and leave it there for 9 hours so the charger will do the automatic tune up equalization of the battery.

If none of the above correct the problem, someone connected the internal battery power wiring incorrectly during FACTORY assembly. I would take it back to the retailer first... before processing a warranty claim.

You can contact DEWALT here:
call 1-800-4-DEWALT

Thanks for choosing FixYa,

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1 Answer

DEWALT DW938 18VOLT CORDLESS SAWZALL can it use Lithium Batteries

As long as the voltage of the battery is the same as the tool, the tool won't mind if the power is coming from a NiCd or lithium battery. You do have to have a charger that works with lithium batteries to charge them up. Chargers that can charge lithium batteries can also charge NiCd and NMH batteies. NiCd chargers are not always programmed to detect when lithium batteries are full and may continue to charge them to the point of melting or starting on fire.

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Dewalt charger dw9116 got wet while charging and won't charge any more

let dry completely . if any corrosion on pcb clean with contact cleaner from radio shack

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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.

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1 Answer

When charging battery flashes red then stays on long should it take to change to green?.its a dewault9130 18 volt

it doesn't change to green, the solid red light means it is fully charged, there should be a legend on the front of the charger to help you with this. If it flashes real fast the battery is malfunctioning and slow flashing is charging and again solid is fully charger.

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1 Answer

Dewalt batteries

There are typically two to three contacts on battery packs. One to charge the battery, one to 120v (household) ground, and in the case of the third contact, grounding the battery pack.

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