Dewalt D25601. Red service Light flashing after 3 seconds.

Roy,
On the front of your charger, you have a menu of what the flashing lights mean. As you get used to seeing the light flashing, you will be able to tell when it is flashing faster or slower. If what you are seeing right now is a slow flash of maybe a flash every second or so, that is normal for letting you know that the battery is in the charging mode and it is charging normally. When it starts flashing faster than that, you maybe experiencing a battery problem. Hope this helps!

Here is the manual for the charger - note on page 2 the meaning of the problem you describe - time to replace batteries (depends how old they are)
http://download.sears.com/own/00925737e.pdf

That being said, check the videos out, perhaps can get it to work after all for a while longer.

These de0245 chargers are designed to detect certain problems that can arise with battery packs which would be indicated by the red light flashing at a fast rate.

If this occurs, re-insert battery pack. If problem persists, try a different battery pack to determine if the charger is OK. If the new battery charges correctly, then the original pack is defective and should be returned to a service centre for recycling.

If the new battery pack gives the same trouble indication as the original, have the charger tested at an Authorised Service Centre.

If you need new battery for this tools

The Dewalt charger's red light will flash while charging and go to steady red when the battery is fully charged. If you go to the Dewalt ServiceNET site at http://servicenet.dewalt.com/ you can search for the manual for any of your tools. DCK294L3 does not have a manual as that is the model number for the whole kit. Search for the model number of each of your tools and you can get the manual for them. Inside the manuals it also describes the different meanings of how the red light is flashing on your charger.

The flashing light indicates the charger is charging the battery (or attempting it) and if it never finishes charging you should try to charge a different battery, if the charger charges that one ok then the battery is bad.

Operator's manual for DW926K-2 is here. It doesn't specifically address solid red light, but that's what mine does when I first put it on, so solid red indicates that it is charging.

If it is flashing the red light with two fast blinks followed by a
pause. This means the power source has out of spec for the charger (such as a generator not producing electricity at 60Hz).

If the red light flashes long, then short, you're in Hot/Cold Pack Delay mode which means it won't charge the battery until its temperature has stabilized.

I hope this helps! If so, please vote. Thanks.

They usually have a little pic on there that tells you what the blinking means. I think it is charging, but sometimes it needs a green light too. Check it out. Mine flashes all kinds of signals, when it hits a dead battery, one that won't charge, it flashes something else. It only takes an hour to charge. Is the battery getting charged at all? Hope this helps.

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.

The specific type of hardware failure can be determined by a "hidden" error code
Turn the xbox 360 on, and wait till the 3 red lights are flashing.
Press and hold the sync up button (the small white one), while holding that button press the eject button.
The LEDs will now blink the first number in the code (as described below).
Release the eject button and press it again.
The LEDs will now blink the second number of the code.
Release the eject button and press it again.
The LEDs will now blink the third number of the code.
Release the eject button and press it again.
The LEDs will now blink the forth number of the code.
Release the eject button and press it again.
The LEDs will go back to the 3 red flashing lights.
You should be able to determine the difference between the 3 flashing lights and the error code lights by the rate in which they flash.
Here is how you interpret the LEDs to get the code number:
All four lights flashing - 0
One light flashing - 1
Two Lights flashing - 2
Three lights flashing - 3

Once you get this code, go to: http://forums.xbox-scene.com/index.php?showtopic=484726
To get the reason for the code.