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Given the problems with Makita Li-ion batteries there are 2 likely reasons, you have a faulty charger or both batteries are faulty, the best option is to find another charger to try your batteries on and see if they charge, depending on the age of the drill you may be able to get the batteries or charger replaced by Makita, a lot of them have been replaced out of the warranty period because they are known to fail prematurely, take the faulty item back to the place of purchase with you invoice and put the pressure on for replacement
To maximize your battery life let them cool down 15 minutes before you put them on the charger.Also let them cool down after charging before use for 15 minutes.Store your batteries with a full charge and condition them every month by using them a little bit and return them to the charger for a full charge.
If light is on charger the charge is fine. You could verify using voltmeter it should put out = to what it says on the back of charger 12-18 volts or so.
Most likely battery is shot after 8 years they just dont' hold a charge anymore and they often will only charge for a few minutes when the chip in the computer tells the charger to shut off due to defective battery.
compare prices of new drills and new batterys sometimes new drill is not much more. Try ebay and harbor freight for ultra low priced batteries.
Try jump starting the battery. Li Ion batteries often have smart chargers if the battery gets to low the charger doesnt recognise it. If yo have a spare battery fully charge it ant then conect + to + and - to - with wire ( may take two people) kep them connected for 2 mins or so then try in the charger.
The problem is your batteries are either over heating or worn out. You might also have a problem with the charger but you'll need Dewalt tech support to determine if it's good or bad.
The first thing to do is clean the contacts. Use a white plastic pencil eraser and clean all the contacts you can reach. If there are any contact you can reach with the eraser use a Q-tip that is just damp (not wet) with rubbing alcohol to clean them.
Discharge your batteries completely then put them in the freezer for 8-24 hours. Take the batteries out of the freezer and let the set 24-48 hours after that put them on the charger, they'll either charge or you need new batteries (more likely) or a charger.
You indicate that the drill is new. I'd suggest you return it for a replacement. Seems to be a defective or wrong charger. If you have problems and If you paid by credit card call the card company and have them stop payment on that 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.
do you have a volt meter toi check the charger voltage? if so then read the voltage out of the charger, it should be 1 or 2 volts higher than the listing 12v would be 13 or 14 volts. if it's working you probally do have a bad battery. if the charger is out then you have a bad charger.