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The Black and Decker is a cordless household drill that can be found by the serial no. LDX 120C

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Black and Decker 20 volt Battery wont charge

I have 2 Black & Decker 20 volt "Matrix" batteries.

During another household project, I used the battery as a power supply for something else. Low draw, was not getting hot. Discharged down to 17 volts. Now when I plug it in, charger just shows "bad battery".

Another just shows "bad battery" on the charger when I plug it in. It's practically new but I have no insight on that one.

Anyone familiar with how these opperate that might have a fix at least for the first one? My suspision is that somehow the battery knows it was used for something it should not have been. If that's the case...can it be reset?

Same problem with older 18 volt "Firestorm" battery. This could be age...but every battery (3) shows bad?

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Jason Cox do you have a model number for either the battery or the drill/driver itself?

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Yes I'm wanting to know can the 20 volt be made to charge again

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I have no experience with Black and Decker batteries, but have had DeWalt batteries do that. I would take the bad battery and place a penny in each of the power terminals. See pics. Take the good battery and make SURE to connect (+) to (+) and (-) to (-). Connect only for several seconds. Place bad battery on the charger immediately. I have revived several batteries in this manner. Please use caution when using this procedure. As a precaution make sure to do this outside in case of fire.

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Wow! This worked perfectly! Thank you!!!!!!!

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I purchased a Black & Decker battery two months ago, and it suddenly died. I tried your method, and It works! I don't know how, but it just works! Thanks!

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I have a black and decker 20 v lithium ion drill battery will not charge the red light is flashing on the charger I have only used the drill once about one year ago how to make it charge?

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Make sure you hook + to + and - to - it shows on batteries - Worked for me

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That is incredible. I wasn't sure it would work. Thank you for sharing this trick!

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Hi Jason. Sometimes you can revive a "bad battery" by manually charging the battery with a variable voltage power supply. In this case you have a 18.5v battery which is operating at 17v. You know that the battery pack is composed of at least (5) 18650 lithium ion cells in series. Voltage adds in series. 18650 cells have a nominal voltage of 3.7v (3.7*5 = 18.5v). Most 18650 cells have a charging voltage of 4.2v. If you charge the pack at 21v (4.2*5=21) or just slightly higher (~21.5v), you should be able to boost the nominal voltage of the pack closer to the desired 18.5v. I have found that manually charging a "bad battery" with a variable power supply for 10-15min will bring up the pack to a level where the genuine drill power supplies will be able to recognize and charge the battery pack again.

Good luck.

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I have NO IDEA what your talking about. I don't want to know how its made I just want it to work!

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I dont know why you would be so rude.

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its one thing to be rude and another to be downright stupid!! this is the type of person why they invented troubleshooting guides that start out with "is the unit plugged in"

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I'm not sure if anyone is still watching this thread, but I'm having an issue along these lines. Unfortunately, I don't have a good battery. I got a LDX120C from Amazon. I plug the battery in, got the flashing red, but didn't think much of it. Came back a few hours later, and it was still flashing. Looked and saw it is a bad battery indicator. Tried a million time to reconnect. If I put it in the drill, I get the led when I pul the trigger, but nothing else. I got a replacement, thinking it was just a fluke. Same thing with the new on. I saw in the manual to plug in the charger before connecting the battery, so I have tried it every which way. Did I just get two bad batteries in a row, or am I an idiot and doing something wrong? Hoping for the latter, so I don't have to keep going back and forth with Amazon n. If anyone has I tip, I'll love you forever!

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@davidknuds46443, did you check the voltage of the battery? I got one of these at a garage sale without a charger. Dumb me thought I could make my own charger. Evidently the battery's charging circuit requires the correct signal from the charger to allow it to charge, because I never could get it to charge.

If your batteries are 18V or higher, I would suggest that you may have a faulty charger. You could test the charger with batteries that you know work OK.

If the charger isn't the issue, then the only way to "jumpstart" the battery (that I know of anyway) is to remove the screws holding the battery case together and directly charging the five individual packs inside. Just be very careful with that! I would check each cell to make sure they're all within .2V of each other. If any of them are lower than 2V, you probably won't be able to revive the battery.

After you get the initial voltage up high enough, you should be able to charge on the regular charger.

Hope this helps!

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@andys67975 Thank you! I appreciate you taking time to respond. I enjoy tinkering with stuff like this, and if I get stuck with a battery in this condition, I will definitely take your advice. At this point, I still have the option to send it back to Amazon, so I don't want to open it and make it my problem. I will tinker a bit with it without opening it, and if I get it to work, I will report back!

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