Here is a replacement battery if needed amzn.to/3voqOCJ

I just did this to 3 dead Dewalt batteries, and it freaking worked!!!!!! Thank you so much.

Lithium batteries are not designed to be used beyond a low threshold of power, usually nothing less than 40% or so, and in most cases the internal circuit board is the charging monitor and it is designed to shut off at a specific point to not allow a lower level of discharge. If a battery sits long enough it will self discharge below this level. Jumping the dead battery charges the capacitor on the monitoring circuit, allowing it to believe it has the lower limit and it adjusts to allow charging. I use an 18 GA wire with a bent loop at the end to plug into contacts lie this in order to not spread the contacts too far. This is a good video, Thank you for posting.

Note he's letting a lot of current flow to the flat battery. There's no resistor in the circuit. This could damage a battery or maybe make the wires hot depending on what you use. Just do it for a second or two, don't walk away.

So.... That worked like a charm!! I watched the clip earlier, gave you the like before I tried it I was that confident. Worked so well I had to return and comment. So for all those who've done this and it worked, Thank you!

What a brilliant tip !! I had a battery that I thought was dead and had put it to one side for when we went to a battery collection place. I saw this tip and gave it a go.....WOW !! Just gave it a one second jump and tried it in the charger and hey presto, battery now charging. Thank you so much for sharing this with us.

Literally the most useful KZfaq video ever!!! Thank you sir!

This really worked guys thanks a bunch

Most useful tip on you tube thus far thank you sir salud!!

Been and done it mate works brilliantly , good on you for sharing it 😊

I’ve just done what he showed me and it’s worked. Not used the battery for nearly 2 years as I thought it was totally gone. It’s now charging. Thankyou very much.

it worked. you are the men!!

Worked great. Thank you

No way..they say you learn something new every day..Thankyou so much for sharing that with us..Have an awesome day & Take care,xx

We followed your instructions with the wires. Thank You it worked. Wouldn't have known this if we hadn't seen your video .

Awesome tip, thanks...I will try this weekend.

So easy when you are shown how!....brilliant!...👍🏻

This revived my 14v DeWalt battery. Thank you.

Best hack I've seen here for months. Kudos for you💙

Excellent video mate

Worked like a charm appreciate it

ABSOLUTELY happy to like your video. Thanks so much for sharing this. Wiring the batteries in parallel is a great tip to transfer just enough power to trick the charger. I had an old mobile phone battery that would not do anything and after putting it on and off the charger many times with zero life I put it in one last time and then it initiated the charger and charged and it's been fine ever since. But you're video jogged my memory so I can't wait to try your idea on my DeWalt 18 volt batteries that are lifeless through lack of use. I love my cordless tools but whenever you need a tool without fail it's always the Old Faithful corded tool that never fails. Cheers again.

IMPORTANT SAFETY REMINDER @RICHIE ...THANKS

Very useful! Thank you for sharing this. I have a bunch of DeWalt tools and will most likely need this at some point.

This is really helpful. Thanks a lot.

Hands down the best video I've seen on KZfaq. You just saved me about $200! Thank you so much.

AWESOME VIDEO. I WILL TRY THIS ON MINE. THANK YOU...

Thank you Flannel, I will give it a try. You are a good man!

Anything that mitigates waste in my book is a good thing and you're a star.

Great job this actually works 🎉thanks

Thank you dude. worked with my m18v Milwaukee batterys....

Straight up worked. Used 20v DeWalt to awaken 20v Bosch for about 3 seconds. Charger blinking now! Ty.

Thanks for the heads up, I appreciate it. I'm gonna try it out this weekend.

Wow. Just tried this on my small lithium flashlight batteries and it also worked. Thank you.

Worked perfectly, thank you!

Thanks mate it worked a treat. You have now got a new subscriber. Take it easy.

Thank you from the UK, something i had never thought of, had two dead 1.5 mah B and D batteries, jump started from a 2.5 mah Power Exchange without issue, saved me buying yet another drill.

Thank you for this. I had a 20v max DeWalt battery that has been non responsive for over 6 months now. I followed your steps and 'boom', back to life. I'm glad I didn't discard it!

Top tip, it loads again, many thanks from the Netherlands

That's excellent! Thanks! I'll keep that in mind for future if they ever go completely flat

THANK YOU SOOOOO MUCH! Had two new Black & Decker batteries that had been left too long without use and the charger would just flash red errors and do nothing. This worked INSTANTLY! They're now charging green!

Thank you! It’s crazy how much $$ these new batteries are! This happened to me years ago before I had seen this trick, and ended up buying a whole new tool bc it was just as much as buying new batteries!

That's great. Thank you for this fantastic help.❤

Fantastic!! I bridged a DeWalt with a dead Hyper Tough and it worked!! Thank you!

This was a great tip! I was about to through a $100 battery away that I had left a charger attached to. The battery has been dead for a year or so at least, until today. Thanks!

looks like a simple fix and I will try it

Nice!! Very well explained and showed.

It worked Thank you very much

Thank you for this video! I have 40v Ryobi tools and one of the batteries suddenly would not take a charge. I decided to try your method, but checked voltage first. The 'dead' one was showing less than 2v. When I jumped a good battery to the dead one, I got a spark when connecting the negative terminal, but only once. I checked the voltage again and that battery was almost up to 40 volts. I put it in the charger and it immediately started charging. Saved me $100+ for a genuine Ryobi replacement ($60+ for a knockoff).

Great tip that worked perfectly! Saved me the cost of a very expensive drone battery! Thank you!

Excellent tip! 👍

Fantastic Idea. Thanks for your help.

Thank you very much from the UK, I was skeptical about the battery fix but I had a second battery that has never worked in over four years. Did your wire trip to spare battery charged and now fully functioning. Many thanks.

Thank for that great tip. I was skeptical when I saw the title, glad I gave it a chance. I use these exact tools and batteries daily in my work and this is a common problem.

Worked for my 18 volt lithium. Went from 2.3v measured to full charge 18v. Held the wires for about 15 seconds. Thank you!

thanks! it works for my milwaukee m18 battery pack

Worked perfectly with my Craftsman 20v! Thank you for this great hack/fix!

Yep, it worked for me 👍thanks :)

That's an outstanding trick! Wish I had know this years ago before I tossed all my older batteries.

WOW! It worked!! Thanks!

Worked on my 18 v Bosch battery!! Thx!!

Worked like a charm on a cheap Chinese 21v battery for a handheld saw. Arrived from amazon seemingly dead. Saw a few little sparks when connecting the last negative wire. Thought that might have caused a problem, but it didn't. Thing charged right up and works perfectly now. Thanks a lot.

The same problem happens with normal 12 car battery chargers, they have to see a certain voltage coming back from the battery to check polarity before starting a charge cycle, it is also a part of the 'anti-spark' and short circuit proofing that if you connect the clips together the charger will not pass any power. Sometimes to charge a battery you need to connect a 'good' battery in parallel to start the charge and after 10 minutes take the good battery away and the charger will happily carry on.

Very good discreption!

Thank you that works

It's a good trick and thanks for the sharing but before you do this, it's necessary to know a little about how these batteries work in the first place. In a charged lithium-ion battery, lithium ions move from the negative electrode (made of a lithium compound) through an electrolyte to the positive electrode (commonly composed of a material like lithium cobalt oxide) when the battery is being discharged (i.e., when it's powering something). When the battery is being recharged, the opposite happens; the lithium ions move back to the negative electrode. Over time, several factors can cause a lithium-ion battery to lose its ability to hold a charge: Cycling: Each time a battery is discharged and recharged, it goes through a "cycle." Over many cycles, the battery's capacity (how much charge it can hold) decreases. This is in part due to the wear and tear on the electrodes from the physical movement of ions. As the ions embed and unembed during each cycle, they can cause structural damage to the electrodes. Solid Electrolyte Interface (SEI) layer: This is a layer that forms on the electrode's surface as the battery is used. The SEI layer is both beneficial and detrimental; it protects the electrolyte from further decomposition but also increases the internal resistance of the battery and reduces the cell's capacity. Over time, continued growth of the SEI layer can lead to significant capacity loss. Lithium Plating: When a battery is charged too quickly or at a low temperature, lithium ions may not have enough time to embed themselves back into the negative electrode. This can cause lithium to deposit as a metal on the electrode's surface, a process known as "lithium plating." Once this happens, those lithium ions are no longer available for charge/discharge cycles, reducing the battery's capacity. Electrolyte Decomposition: The electrolyte inside the battery can decompose due to high temperatures or overcharging, which can lead to gas formation. This can cause the battery to swell and potentially fail. When a lithium-ion battery "dies," it means that enough of these processes have occurred that the battery can no longer effectively store and deliver electrical energy. The ions can no longer move efficiently between the electrodes, so the battery can't produce the energy needed to power a device. The battery might still have lithium ions, but they can't move in a way that's useful.

You just saved me $20. Thanks Dude. Only took a few seconds on my 20V lithium. Liked....

Brilliant. Thanks for sharing. Was about to toss a workx battery

Good information to know. Thanks for sharing! As Always, May God Bless you and yours! 😇

WOW, THANK YOU!!! I was about to throw my drill and buy a new one, thanks for sharing your video....

Holy smokes, where did you learn to do that? This will definitely be helpful for me, thank you so much.

So cool it works ! Thanks a lot ! Greetings from France

Very impressed Thanks so much Andy Goode i new it could be done but had to see how it was possible

Turns out I needed to charge my Milwaukee M12 a bit more to get over the safety limit for the charger to engage. 8 minutes seems to have done the trick. Thank you!

It worked great - I found it worked easier if you flatten the ends of the wire before inserting into the battery terminal

Saves a TON of money on buying new batteries! Thanks!

This is a great idea provided you Have 2 batteries and one is in good condition! Usually my situation is the battery will indicate charged, but only last a few minutes.

Worked like a champ. Can use pennies in the slots and then use clipped wire leads. Thx!!

Awesome tips thank you

Thanks gonna try it.

I have used this technique for 8v golf cart batteries. I boosted each battery with a 12v charger for a few minutes, then wired the batteries (6) in series for a total of 48V. The charger for the golf cart is "smart" and needs to see a minimum voltage to start charging. Thank you for providing this method for tool batteries, I would have never thought to do this.

Fan-TASTIC video. Who would believe that it's so simple to fix? The explanation makes perfect sense - without even the tiny amount of charge needed to send signal to charger that all's O.K. to recharge - it wont! This must save so many people (including myself) so much time and money. Many thanks for posting.

Thanks for the tip.

Thank you absolutely worked.

I do have this going with one of mine for 6 months. Glad I didn't throw it away. I'll give it a try today! Thanks

An incredibly useful tip. My son returned a totally exhausted Bosch hedge trimmer. I was about to toss the dead battery but tried this hack. It worked beautifully and has saved me at least £60. Thankyou!

Thanks for the info. I did it and it worked. JP

Thank you for the tip… I’ll try it. I have a dead 12v one. God bless you

Wow..this was pretty awesome and was great to learn this technique as I have a Ryobi drill and you know how expensive these canbe I also told my hubby about this and you thing I hung up the moon using said drill ...So thanks for the new status in the world of tools and women ...lol am going to subscribe to you so hope to see some more vids that wow me, thanks for the tip though am going to share this with my friends if they need it and share your site with them too 👍👍

Holy cow ! This is a great tip. It would have been nice to have known this a couple of years ago before I retired. No telling how many good batteries I tossed and bought new to replace them. I worked my tools hard, so I just figured I pushed them too much.

Thanks! Saved me and my Dad!

Excellent tip! Thanks.

*WELL DONE!!* As a some-time Home Depot hardware guy, it would so bum me out when DeWalt guys would come in with DOA batteries. This little hack will get a number of 'em back in business, and (as a retired economist) leave me with much happier customers. *THANKS.*

My friend came round today with his Bergman 18v 'dead' battery,-he couldn't get a new one anywhere,-so we tried your trick today using my Bosch 18v battery. It worked a treat,-so thanks a lot for this video!

Earned yourself a sub, what a tip, I just saved my £40 battery, brilliant, thanks

This was very helpful, thanks.

Great tip. I haven't used this on power tool batteries, but similarly I've found that on car batteries, the newer chargers with all the sensors can have the same problem with very low batteries. So have yourself an older style car battery charger that will push charge Into it. Then you can use any charger after that.

Thank you! This worked on my Bostitch BTC480L that aren't made anymore. P.O.B., Sir! 👍

Just repaired all my dewalt 12v max. Thank you so much!

Thanks much for the tip! I have a "Ridgid" and a Ryobi drill. I'm gonna give it a try and see if I can re-use them.