Why does cordless drill charger light blink off after 3 seconds?

You need a new charger.

battery is open circuit or charger not working Re: Jeff

Don,t worry about lights,just check if the batteries get charge.If not your charger is fry.Is time to buy a new one.

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One thing I,ve found with cordless tool batteries is that if they're completely dead, the charger won't recognize them. Try hooking a known good battery with a charge up to the problem battery, terminal for terminal, with small jumpers. Leave it hooked up for a minute, maybe a minute and a half. this should be sufficient to provide just enough charge to bring the battery up to the "threshold level" required for the charger to recognize it. Then, simply charge the battery in the normal way. If this doesn't work, you may need new batteries, or a new charger. Hope this helps you.

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.

Batteries need reconditioning, but likely they need to be replaced if not new. If new, the charger may not be working.

sounds like my charger, not making good contact

wiggle the battery around while pushing down and you can probably get it to make contact

sounds like you just need a new charger

try wiggling the battery around and see if a light flashes

also look and see if a light flashes when you plug it in

i'm about 98% sure it's the charger

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.

ok you need to zap the battery, if you have a jump box or a battery charger that has at least a 20 amp or better charge selection, like a engine start feature.

the post of the cordless batter has a center post marked on the sides is a plus or minus sign.
the should also be some vertical slits in the plastic post on the corners, clamp the leads from the jump box or battery charger positive to positive , negative to negative. with the car battery charger you can probably slip one side of the battery clip in the plastic slot the other on the connection blade. plug in the battery charger and let it on for 5 or 6 minutes. if the battery charger has a auto shutoff the light will blink off and on but that is ok .

take the cables off and plug into the battery pack charger now you should get a red charge light and now can charge the battery.

if light does not come on try it in the drill or saw and see if you had any more charge than before if so you might need to repeat the procedure and leave it on the car battery charger a little longer