It didn't work for me. My older original battery still works but has only a 15 minute life span and then charges up in only a few minutes and works again for 15 minutes. Newer battery sucks.

It will work but It will never hold a full charge again 😂 battery is junk at this stage. Just buy a new one and move on.

It worked! I did this trick, used it for a bit, now it’s actually charging. I can’t believe it. Thank you!

Tried this today and had it work for the first battery set. The second battery set burned up the wire and about started a fire in my garage. It killed one of the batteries entirely, but one of them is still okay. Kind of terrifying! Probably not doing this again.

That type of wire twist needs solder or it's very weak. The twist caps were better.

Dude! This actually worked! This is literally the best video to date! Thank you man!

Nice surprise for me cause this worked! I was about to toss out that battery. Thanks ! One note, my wires got very hot. Be safe out there.

Worked on twelve 6.0 batteries a guy was gonna throw away. Saved myself quit a bit of cash😂

just did this trick. left the batteries wired together for 30min. still giving me fast blinking one bar on bad battery. plugged it on the charger for 5 seconds and pulled it off. had full charge and worked perfectly. thanks.

Iv been searching for days for someone with a good video apparently I’m going to have to read up and make a video because either it’s someone wiring a trailer or using existing wires to make a new one I want to know how to wire in one that never existed before because mine is messed up and I don’t feel like tracking it down I’d rather just make a new one.

How can you call this guy a jack off for using twist wire connectors when you did no better all you did was twist the wires together and used heat shrink that’s just as bad as twisting the wires together and using wire tape, soldered or used connectors and then use the heat shrink over the top of the buck connector or the soldered wire.

Had a battery that didn’t work for 3 years! It’s fine now lol now I got my backup back! This really works, an I legit used just random metal lol like from a badge the clip thing I broke it down then flattened it an put it battery to battery for 30 mins my other battery lost one bar an then it finally would charge again/fully charge! People say be careful use a fuse or whatever but I had no issues both my battery’s are good now! Hell ya!

I'm fine doing it the wrong way I just want to know what damn colors go to what damn colors

I’m a dumb ass I put the blade on them and I accidentally did positive negative and now they don’t Fukin work LOLOL

Did your working battery get super hot? Also, did it work afterwards?

Tried it but now when put the battery on the charger there a green and red light flashing constant any advice ??

Fake news did not work almost caught fire!

Damn i got fews brand new m18 5.0 and 8.0 dont let me charge. It solid green. I dont know wat to do lol.

Didn’t work for me. My dead battery technically charged but when I put it back in the charger to charge fully to 100%, it still thinks it’s fully charged even though it isn’t…

This does work.

Unfortunately hasn't worked for me. That's not to say this method doesn't work. There can be other factors also present in my battery that prevent this method from working. Have read comments on this section about the jumper cable burning that is a result of either an additional fault in someone's battery, or jumper cables are too thin and the current (amperage) is strangled when passing along the jumper cables or as you have mentioned many times about polarity mix ups. It's no different to jump starting a car. If the cables get too hot or burn then they are undersized. Perhaps I will try this method again as on the first occasion I used a healthy 3ah to jump a faulty 5ah whereas I should have used like for like i.e 5ah to jump a 5ah. If it works I'll definitely drop a comment about it. If I don't reply back its because I'm still trying. Thanks anyhow, the video was clear and concise. Hate long winded videos before they get to the point, by which time I've usually skipped to the next video.

I was about to open it up and charge each bank in there. But i saw this video and followed your way. And i charged it with my yihua charging and soldering station for about 20 minutes then inserted the battery back to the milwaukee charger for 5 second and pulled it out and pressed the button and all power came back. Thanks for the info.

I tried this and it "let the smoke out" of my wires :-(

Wow I’m so cool I have battle axes tattooed on my hand

Thank you so much.. I have a dead battery which I was about to throw.. I did your way and worked🎉🎉🎉

"I followed all the steps indicated in the video and shortly after connecting the cables, sparks began to appear and the battery almost exploded, spilling red liquid. Now the new battery that I had connected does not work and is damaged." I don't understand all those positive comments if the battery almost exploded and would have caused a serious problem and also to complete the new battery it was damaged.

i have two 12s that are only charging up to 3 bars any suggestions?

Just did this and it brought my battery back in service. Took few times to get a good connection between batteries. I left them connected together 25 minutes. It worked. Saved me buying a new battery eventually.

Someone bought cheap wood and glued it together and returned it for store credit smh

Steaming load of bow locks. Just end up with 2 flat batteries, one of which is too hot to touch and made noises ready to explode.

I’m not a contractor, so is that a good price for wood or expensive?

If you don’t have it make it!!! That’s what the pros do??

it's impossible a 18V battery (of any capacity), charges fully an other 18V battery... 😒

Thank you this really work I charged my dead 2.0 Red Lithium Battery using 5.0 RLB

So much for doing it right.

Hey do both batteries have to be the same volt amount for it to work ?

Thanks i

Worked thanks for video.

I’ve done this was some really ok craftsman batteries I had. It’s always worked. But I tried the same thing with my Milwaukee battery and no luck.

Thank you for the video you save my battery

Nice work, thanks for sharing...

👀 *promosm*

I do this and the batteries show no change and the source battery begins the same issue. I’m a Milwaukee fanboy, but I have DEWALT batteries from 2015-2018 and they never have this issue.

Great video and thanks for trusting our HD Flaps. Grateful for the support!

things are expensive but so damn rubbish of equiment

Totally worked! Brand new batteries, still in the package but they were sitting for 5-6 years and wouldn’t take a charge. Now they’re fixed, thank you!

Man thanks for this video it worked for me too. had a battery that I hadn't used in a while and no lights would come on but came back to life

Nice work! I'm glad to see you on YT.

Car battery, work's too , I do that

Thank you my friend I truly appreciate your kindness and wisdom! Of all else Hope you have a wonderful day!