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
SOURCE: Dewalt battery charger
You will need he correct charger, the 24V will destry a very expensive battery.
SOURCE: I purchased a new charger for my Dewalt Cordless Drill
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.
SOURCE: broken dewalt battery 18v lithium ion
When a Dewalt charger is showing a fast blinking red light it means the battery is no longer chargeable. It may be because of a bad cell or short inside the battery. Whatever the reason the charger will not charge the battery and it needs to be replaced.
SOURCE: My DeWalt DW9116, battery charger lead light is fl...
Brown
Brown
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R21 = 0.11 Ohm at 5 percent
Now can someone help me find the schematic for this model? DW9116
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On 3/5/12
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The charger blink fast even thogh the battery not inserted in to charger means battery charger shows battery is faulty even thogh the battery not in charger
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