This is unbelievable!!!! I have battery's and tools on my bench that I was about to throw away. They have been on the bench for at least five years . I tried this today and ALL FOUR BATTERY'S CHARGED!!! THANK YOU !!!!!!!

It worked! Some people were advising to connect it to a second charger or a car charger that I don't have, but I bought the 9v battery and it worked. Miracle!

Accidentally left my 14.4V in the garage this winter. Tried this for a couple of minutes, and it works! Red light is on, battery is charging as normal now. The cold weather must have taken it to extremely DEAD until this idea jump-started it so it would charge again. THANK YOU!

@DoItWithDave

5 жыл бұрын

I'm glad you found this video helpful. Thanks for watching!

Just bought a older Milwaukee cordless set off Ebay for 20$ said the 3 OG batteries wouldn't charge ( no light) bought a new Energizer 9volt put it on all 3 friggin worked like a charm. Thanks a lot. The drill 3 batteries and charger plus case are like New. What a deal! Bought it after watching your video for a joke, but it friggin works. Gave it to my son because he's broke. Now he's using it all the time. Once again Thank you sir for sharing such useful information.

Thanks! This still works in May of 2022. I had an older drill and battery that had never been used very much. I had recycled one of the two batteries that came with the drill a few years ago when it would not take a charge. I did a slight variation on getting a little charge into the Milwaukee battery. I dug up an old 9v wall adapter that had powered a long gone Wi-Fi access point or something like that. I put a small brass screw into the center of the AC adapters plug to capture its positive(+) output and then used some alligator clip jumper wires that I had hanging around to connect the positive(+) voltage to the left connector on the battery and another jumper wire from the barrel of the connector to the right side for the negative(-) connection. I let it sit like that for perhaps 15 minutes and then pulled the wires off and put the battery into the charger base and BINGO the red light now lights up indicating that it is charging!

@DoItWithDave

2 жыл бұрын

Wow you definitely upgraded this method! I'm glad you got your batteries working again. Thanks for watching!

Thanks for the tip! I found a old Milwaukee combo set in my garage I'd completely forget about. Both batteries wouldn't change after fifteenth minutes with a 9 volt battery they both took a charge.

This worked perfectly on my 15 year old Milwaukee 14.4 nicad. 9 volt battey charge for 3 minutes, and now a red charge light. Many many thanks. You rock. 🤘

I was on the verge of buying a new charger and battery. Since mine is a very old model, and it wasn’t working/charging, I thought I needed to get some new ones. You have saved me from that. Thank you soooo much for sharing such a helpful video!!

Believe it or not, I was just looking for how to line up this very issue, then went to KZread to find an answer. Thank you very much, Dave.

Ok, I tried it. IT WORKED! I can't hardly believe it. So I have many dead batteries (OLD) and am now going through them to charge. Glad I didn't throw them out. Very grateful!

@DoItWithDave

5 жыл бұрын

Nice I'm glad you found this video helpful!

This is one of my favorite hacks ever. Just used it successfully on one of my Milwaukee 14.4v batteries which hasn’t worked for years. I couldn’t get it to work by just sliding the battery up to the terminals, it wouldn’t reach…so I just used a couple of wires to connect positive to positive and negative to negative.

@NO-hd8sx

7 ай бұрын

Will this work on old Milwaukee 28 volt battery?

@JandT98086

7 ай бұрын

@@NO-hd8sx I don’t know, mine was a 14.4 volt

I tried this on a 12 year old Milwaukee 18 volt battery that i found that was dead dead. Volt meter read 0.0. Hooked it up to a 9 volt battery for about an hour and BINGO the charger recognized the battery and it charged it, Great Tip Thanks

9-2-2022: Tried this and it worked! Couple of comments: 1. My battery had probably been dead for several years, so 3 minutes wasn't enough. I tried again, and went off and did something else. It was maybe an hour of jump charging, and that was enough. 2. My 9v didn't fit into the little box around the terminals as easily, so I had to mash the negative terminal on the 9v with pliers into a football shape, which means I now have a dedicated jump-start battery. Small price to pay.

Have the same batteries could not believe how much money i wasted this just saved me from buying two more batteries worked great wish i new this about 5 yrs ago

Just tried it on a well used battery shelved since 2006. It works. Charged. Working again. Thanks man. 1 note. Use a new 9v

Thanks for the tip. I didn't have a 9 volt battery so I just jumped from a full battery to the dead battery. I left it hooked it up for a 1 1/2 min. and it worked. Thanks again.

I don’t even know where to begin to say thank you. It ABSOLUTELY worked. I was so bummed that I had to pay for a new battery but now it’s charging. There was no light when I plugged it in. Thank you for taking the time to make this short video.

legend mate fixed 2 brand new batteries using this method however i used 2 x iphone eject pins and connected 9v battery got them charging instantly can’t thank u enough fella ;)

Wow, I wish I had seen this video before I purchased two new batteries several years back. Timing is everything, huh? Excellent tip; thanks.

Ok. I'm not sure what 30 secs of 9V does, but it absolutely did work for an 18V Milwaulkee NiMH slide battery. I would be interested to know why this works. Thanks for sharing, if nothing else I now know the charger still works!

I DID FLOW YOUR ADVICE MY TWO 14.4 BATTERIES BACK TO LIFE AGAIN THANK YOU FOR SAVED ME MONEY. 😁

Omg! You just saved my two batteries, man! Thank you thank you thank you!!!

Well I’ll be! It worked! Mine is an M18 RedLithium XC 5.0. Had to make a small wire set (red & black) 20 AWG to slide into the battery terminals and wrapped the other end to their respective 9V terminals. Waited one minute and BAM! Now charging. You just saved me at least sixty bucks.

@DoItWithDave

4 жыл бұрын

Well done sir, thanks for watching!

Thanks bro ! You just saved me from throwing out/Recycling my one Milwaukee battery...

Thanks, brought my old Milwaukee Drill battery back to life. No need to buy a hole new drill.

Great tip. It worked on my M12 battery. I wish I had seen this sooner…I’ve thrown several batteries away.

@kenmatthews6476

Жыл бұрын

Update: The hack only lasted a few days. The battery is no longer charging.

Hey , This TOTALY WORKS! Thanks for sharing!!! Shawn in Colorado

@DoItWithDave

9 ай бұрын

Glad you found this video helpful. Thanks for watching!

It worked for me too. I had loaned my drill to a family member and I suspect they ran the batteries down so low the charger didn't know they were there. Used this trick to wake up 2 batteries and they are going again.

Damn good tip! Just saved 3 18 volt power plus batteries with your advice. Thank you.

Excelent tip i used a 5.7 phone power supply and it worked great. 30 seconds and it actually started charging.

@DoItWithDave

5 жыл бұрын

Wow that's pretty cool! Nice ingenuity. Thank you for watching and thank you for your comment!

This technique worked for me (thanks) but not right away. even after the connecting the 9-volts to my dead batteries, there was no response at all when I placed the 18-volt batteries to the Milwaukee charger. I suspected he charger since both batteries went bad simultaneously years ago. I bought an after-marked charger. Eepeated the process, and it worked like a charm. Of course NOW the original charger is working again. Still, I invested about $45 and instead of $250.

Bro! This totally worked. Saved me about $150. Thanks!!

I have newer battery and charger M18 red lithium XC 3.0 AX . Had to use 2 short pieces of low voltage wires to connect from 9 v battery to m18 terminals for 3 minutes and it did the trick..Thank you! Saved me some $$$

I tried this with, what I believe is, the “newer” style M18 Lithium 2.0. This battery was new and never used for 3+ years. The charger unity flashed green/ red. I inserted single edge razor blades into the positive terminal and another into the negative. I then used jumper wires to a 9 volt battery. After 2 minutes the 9v started to sizzle. I then immediately disconnected the jumpers, removed the razor blades and plug the M18 into the charger. It worked enough to get 2 bars of battery life. I then held in the battery status button for 5 seconds, released the button waiting about 45 seconds for the battery to cycle through. The battery is now charging. Thank you for the tip. User must assume all risks. If you’re not comfortable trying this, DON’T attempt this fix!

@DoItWithDave

2 жыл бұрын

Well done. I'm glad you we're able to get your battery to charge without hurting yourself or damaging anything. Thank you for your comment, it really helps everyone seeking advice on this issue.

Awesome video! Worked like a charm and saved me a few hundred on new batteries for my old Milwaukee 18v 2.4A reciprocating saw. Thanks!

@DoItWithDave

2 жыл бұрын

I'm glad you found this video helpful. Thanks for watching!

It worked for me as well, and with an old 14.4! Thank you! !!!

Worked great on both of my Milwaukee 14.4v NiCd batteries! Thanks

@DoItWithDave

5 жыл бұрын

You rock! Thank you for watching!

Picked up a work light , drill and sawzall with a charger and a couple of batteries at the end of someones driveway everything looked new but batteries were stone cold dead tried on the charger and nothing. Then I happened onto your post Batteries are charging now thanks to your trick.

@DoItWithDave

4 жыл бұрын

Nice find! I'm glad you found this video helpful.

I was about to recycle 4 of my 5 old 14.4s. Thought I'd check google to see how cheap I could rebuild when I came across this vid. Used my last good battery and a couple jumpers and like magic, I now have 5 batteries charging. I did an led conversion on a couple old milwaukee flashlights. Going to check run time but pretty stoked that I have additional work/emergency lighting. Thanks for the video!

I have 2, my gut feeling was there got to be a way. I'll try this out tomorrow at work. These batteries are in very shot supply right now, so any way to get these ones going will be a money saver for sure.

Thanks a lot , your idea and solotion is the best.👍

This worked for me but I had to use two light jumper cables with alligator clips on each end. I attached one wire to the positive on the 9V battery and the other wire to the negative side. I engaged both connectors for the battery negative terminal. Waited three minutes and the battery charger had red charge light on. Thanks much.

@DoItWithDave

5 жыл бұрын

Awesome! Thanks for watching and thank you for your post.

Sweet I'm going to give this a shot with one of my dead Ryobi batteries!

Thanks for the great tip. Had an old 14.4 battery that had been sitting in the garage for years wouldn’t charge, took your advice and it’s now taking a charge.

@DoItWithDave

5 жыл бұрын

Alright! I'm glad you found this video helpful. Thank you for watching!

Kudos! I had recently bought a new Milwaukee 18V NiCd battery & charger, because the one I had didn't charge when place on the charger. Saw the video - followed the instructions and presto, it worked. Great tip!

Your video was very helpful, I was able to fix my M18 batteries. Thank you for sharing.

@DoItWithDave

2 жыл бұрын

Nice! Thanks for watching!

Worked fine on a M12 Red Lithium battery after applying 9V for 20 seconds.

@DoItWithDave

5 жыл бұрын

Awesome thank you for sharing! It really does help the DIY community.

This worked great. I salvaged a battery. Thanks so much.

@gilramsey3518

Жыл бұрын

Update: I salvaged another battery 2 years later. Thanks once again.

wow I will surely give this a try first and if it works thank you and I will let you know the outcome! Actually I could not get the battery to make contact because of the little sliver of plastic in the middle!

This is a awesome video I was literally thinking I had to buy new batteries I sure do appreciate your knowledge

@DoItWithDave

5 жыл бұрын

Awesome! I'm glad you found this video helpful thank you for watching!

found a mint milwaukkee drill with case on side of road charger didn't work I tried this trick from the video and wabammmmm it worked. thanks for uploading this video

@DoItWithDave

7 жыл бұрын

Alright nice find! I'm glad you found this video helpful.

Tarnation son, it worked on my old Milwaukee 18 volt. Multiple thumbs up to you, a very expensive battery repaired for free!

@DoItWithDave

Жыл бұрын

I'm glad you found this video helpful. Thanks for watching!

Thanks for posting this! It may have helped saved my old 18V NiCad packs as I'm finally able to get the charger to charge them. For my packs, a 9V battery wasn't enough to give them enough of a charge to bootstrap the charging process -- I had to use a car battery charger on them for ~10 minutes.

Attention do not imitate! fire and / or explosion hazard !!!! A cell is defective and it remains defective! your effect is only temporary! protect your health and your life! best regards from Germany. Thilo Schieschke.

Very fast delivery.

Thanks, had some batteries that haven't been charged in 1-2 years and this worked great for one that did not want to charge.

@DoItWithDave

3 жыл бұрын

Nice!!! Thanks for watching!

Totally worked for me with same batteries and charger. I guess the lesson is not to let your batteries go totally flat.

Great job. It worked on brand new batteries. Should have watched the video before I returned/exchanged both the battery and the new charger

@DoItWithDave

4 жыл бұрын

I'm glad you got your batteries up and going. Thanks for watching!

Awesome tip... worked perfectly on my 14.4 Volt Milwaukee batteries. Thanks!

Wow I will try it,you can also get an adaptor that takes the new milwaukee batteries, it's under $20

I have yet to try this on my m18 battery, which doesn't charge at all. I hope this works for me. Thank you in advance for this helpful video!!

good job DAVE!! THANK YOU FOR SHARING ... and i did all your requests at the end of your good teaching/sharing video...M

@DoItWithDave

5 жыл бұрын

Thank you so much. I'm glad you found this video helpful!

Seems to have worked...i had one that wouldn't charge..put the 9v battery on it and then put it in the charger and it took a charge...thanks

Thank you. Good info. I got a 28volt will try it on possibly.

@bobbiebale7310

3 жыл бұрын

Did it cause i want to know if I'm doing it wrong or if it just won't work on a 28 volt

It worked perfect. Thanks for saving me money!!!

Unbelievable! 😲 thanks a lot. It worked 😁🙏👍

Perfect. Thanks Worked on a Hitachi 12v. Model: EB1214s

Great Dave. It works. Thanx a lot.

@DoItWithDave

3 жыл бұрын

I'm glad you found this video helpful

Thanks good vídeo, i was looking for they positive and negative, they vídeo helped me. I used the 12 volts car battery and ir worked

I would not use a 9v for this which as someone else stated could explode. I always used a small 12 volt charger on the lowest setting and only for about 5 seconds in reverse polarity direction. It vaporizes internal deposits that form on plates of ni-cad cells and choke it out. I never tried with lithium as I don't know if your should. The last I knew, the Post Office doesn't even want lithium laptop batteries shipped thru the mail because of their inherent dangers. Not sure if thoae same dangers apply to cordless tool ones. I've also found that this is not a long term fix. You can charge them and use them immediately or fairly soon, but the charge doesn't hold for days like they should. Nothing is as good as buying a new.

Worked on my 18V Milwaukee battery, thanks for a great idea

@DoItWithDave

5 жыл бұрын

I'm glad this video was helpful. Thank you for watching and I appreciate you commenting.

ive returned 3 drill sets so far and out of the 6 batteries that were in them only one would charge im not gonna jump start them im just going to buy a different brand

My question is about the charger you are using . I have a similar 1 hr charger ( Ni-Cad only ) with top up & conditioning mode , but the only light that works is the red charging light . After an hour or so the light goes out , the battery is between 19-20V ; but it looses power very quickly when being used ? The 2nd & 3rd indicators never light up ?? Are they supposed to ? The 4th is the battery hot/ cold indicator . Any insight into what the problem is would be greatly appreciated ! Thanks.

It worked for me thanks

@DoItWithDave

2 жыл бұрын

Nice!

Thanks bro nice job

Thanks bro,it worked

This worked well, just as you described on your video. Thank you!

I tried it with one for 3 minutes nothing. Tried another 30 seconds and the red light came on! Wow! still waiting to see if it really charges.

Thank you for the tip. Kudos

Worked for me. Got two "dead" battery packs charging again.

This really worked on my black and decker battery., Thanks

I just got hold of some v28 tools. Only 1 battery with them. The charger turns red quickly them it starts blinking green then red, any suggestions to try besides this one above. It tryed it already. Thanks for any help anyone can give.

I have a Milwaukee battery that is 28 volts. What voltage of battery could be used on this?

It worked, thank you so much!!

I just tried jumping a milwauki v28 from an 18v makita, left it an hour and nothing?

worked great 18 volt NiCad Porter cable thanks again

Ths definitely does work. Thanks much, Dave it really worked well as a jump start. New Subscriber!! 👍🏽🙂.

OMG ...SIR THANK YOU! IT WORKS THANK YOU THANK YOU

Man that works, great video

Make sure you use a good name brand battery. This trick failed with me using dollar general batteries. I tried it with energizer and worked.

@DoItWithDave

4 жыл бұрын

Thank you for posting this information. A couple of ppl stated this not working and it may be do to using a low quality battery. This info will definitely be helpful for the YT community. Thanks for watching and posting!

@jasonhull2163

4 жыл бұрын

@@DoItWithDave Forgot to mention one thing. Set the other battery on top of 9v applying a litte down pressure. You may need to let it sit a few hours or completely drain batteries and start over. I have this same drill that was never used. A friend of mine gave it to me before he died. Batteries were never charged. Be patient it should work to get them to charge. I ended up using 2 batteries on both drill batteries.

Merci à vous vous avez sauvé ma batterie et vous m'avez évité de payer 100€.bon courage à vous je vous souhaite beaucoup de succès.

@DoItWithDave

3 жыл бұрын

Je suis content que vous ayez trouvé cette vidéo utile. Merci d'avoir regardé!

Hi, I have a Milwaukee Drill V28PD and a V1828C charger. Will I be able to charge and use an 5AH M28 red lithium ion battery, or it is not compatible with that drill and charger?

i got M12 batterys that are currently doing this gonna try it

Does this work on all types of batteries? Example, lithium, nicad, ale, etc

Fixing to try this.

Worked to get the red light to come on but the battery will not take a charge. Stops trying to charge after about 5 minutes. Assuming my battery is just bad.

@christurnblom4825

5 жыл бұрын

Could be but there's other ways to check. I'm assuming you have lithium-ion batteries here. If you crack it open there's going to be several cells wired in parallel, meaning positive to positive, negative to negative. unless it's a really small pack with only one battery per cell. The cells are wired together in series, meaning positive to negative. They usually use "18650" batteries, they look like a large "AA" The vast, vast majority of 18650's are 3.7 volts nominal but at full charge they are 4.2 volts. Get a voltmeter and check each cell. If any cell is lower than 3 volts (or possibly 3.1-3.2 depending on circuitry) The board will often refuse to charge. This a safety measure to cover the manufacturers ass. It's highly unlikely that dipping below 3 volts one or twice is going to make the battery unstable but, again ..."CYA". This is often the reason the stop taking a charge. I don't know why the 9 volt works but there's so much circuitry in those things it might be able to take the 9 volts and start distributing it to each cell and that will make it able to take a charge but I'd bet that if you took the 9 volt off and didn't try charging it for an hour, it woulnd't take the charge because the voltage will have dropped. The first thing I would think of with the battery you mentioned is that it's as you say, "just bad" as in, it's gone through too may cycles or stayed under 3 volts for too long and won't hold charge or more than a few MAh. If you have the time and spot welder, you can check each individual 18650. You can buy the grade "A" ones online for around $2 a piece. the Grade B&C are cheaper but unless you know what you're doing don't replace them with anything that is not Grade "A" and/or has a rating of 5C or higher, just to be safe. Actually, without the knowledge of what a C rating is and how to use it, you'll be lucky to find what I recommended for less than $4 a piece ...from a reputable dealer. some of these guys flat out lie. They buy grade "C" and relable them to grade "A" . I could explain it all but you have the internet and this post is too dam long already. ...also don't mix & match in cells, that's potentially dangerous. They need to be the same MAh.

Thanks it worked

Can this be done to the new 1.5 AH BATT. Pack?

very good thank you for vidos

Did you use the center pin as negative or the outer right pin.