DeWalt 20v Max Lithium Battery Rebuild - Mikes Inventions

[dogukancil]

Those batteries you tried to put in there are protected cells. They each have a protection circuit on top called a BMS, for battery management system. That's why they are slightly longer and have a knob on top and also why they don't fit into your battery pack. Since your Dewalt battery pack has a BMS of its own, they are really not necessary. They add extra resistance, parasitic loss, limit the current and worst of all, they glitch out and cut the power on really high loads, because high loads will momentarily lower the voltage below the threshold voltage, which is usually around 3V. You can actually very easily remove the protection circuitry if you remove the shrink wrap on those batteries. They are connected by a nickel strip. They are not really designed for high power applications like a power tool. Flashlights infamously do not include a BMS, that is why they are mostly used in those applications and plus the knob on top makes it easier for regular folk to locate the positive.

[homandbackyard]

Never know and see a spot welder like that. That really impressed me! Thanks Mike.

[GutsyGibbon]

Well, you inspired me. I had a bad Black and Decker tool battery and decided to rebuild it. I bought the little welder and a set of new 18650's as you did. Big surprise! When I went inside to start desoldering the wires, I found a sense wire that had broken. I resoldered it, and the main positive and negative leads that I had already desoldered. I put the battery back together and it is working just fine. I guess the welder and spare 18650 will have to wait until another of my batteries fail.

[tylerwillems]

Dude, I am absolutely doing this. Awesome video, thank you so much. And honestly, your commentary has to be like 60% of the enjoyment of watching this, love your enthusiasm.

[malayekk]

I think the spot welder is the main tool to do this job right along with right type of batteries. Phenomenal work mate. Thanks for sharing.

[johnrhodes]

Those Samsung 30Q were ideal for your needs. Good Capacity, Adequate power delivery, and great value for money.

[chuckinman]

I took apart a 4 AH battery and instead of cutting the terminals on the bad cells I used a drummel tool to cut through the spot welds and I have enough of the terminals left to attach them back to the new batteries.I also marked them + and - to insure that the new batteries are put back properly oriented. Doing it that way I only have to solder, or spot weld, the terminals onto the new cells.

[KimFatica]

This was a great find...of course, the day after I purchased the new DeWalt Powerstack batteries to replace my two old DCB201 batteries. The new Powerstacks use pouch cells vs traditional cells. The Powerstacks are a more compact form factor with a slightly better power output. I have a big, clunky DCB230 (3Ah) and a DCB205 (5Ah). This tutorial should be helpful when one of those begin to choke. Thanks!

[kirbycollins]

That Spot Welder is a Must Have For Many Types of Small Electrical Projects

[lolslim]

Oh I know that feeling, I found a Milwaukee M12 3.0 the one with the square bottom from a recycle bin, and I already had salvaged 18650, and I repacked that m12 and use it at work.

[JohnClutch]

Ive said "perfect timing" many times in life, but this video tops them all on perfect timing!!!! Thank you

[johnclarke]

I had a short negative lead on the 21700 pack that I built. I stretched the lead and soldered it. After a week of use the pack went dead. I pulled it apart and the negative lead had broken its solder joint on the plug. I removed the wire and put a longer 16 gauge black wire on it - no problems, since. If the wire are tight plunging and unplugging the battery can break these connections. I always put a little extra wire on both the red and black leads.

[RiccardoPearlman]

Killer work dude. I have a bunch of these dewalts and I even power my cameras with them. I was planning on having to do this down the line, and it's great to see that the battery controller tolerates cell replacement- and even a cell upgrade! Those Samsung 18650's are definitely the way to go.

[stewartbruce]

Excellent tutorial Mike. No loud obnoxious music or sensationalism of any kind, rather just easy to follow, and a pleasure to watch. I would like to buy the bangood spot welder. What is the model description? Thank you for your video.

[denverdanoreno]

Mike you keep it simple in a very complicated world. Thank you buddy!

[TomYoureDoingItWrong]

I have been playing Hell trying to get the bottom black casing separated from the battery cage on a DCB404. Now that I know it is probably RTV'd in place, I might get a little bit more aggressive with the screwsticks. Yours is the best video I have seen on actually doing something useful with these batteries. I have tried the jump-start technique to no avail, so I would like to actually measure each battery with a multimeter. Thanks for being detailed. New subscriber on board!

[kleinstruction]

First time seeing spot weld soldering! Can't wait to try it!

[mystic]

Wow, the way you did this is great. I have so many batteries going bad it will be worth the time and money spent. I will take a picture with my phone before I disassemble ( I am so forgetful).

[skiterbite]

Great production Mike, thank you so much for your professionalism and you're a cool dude to boot!

[WaltWW]

This is most important to rebuild batteries that are no longer made like the 18v l-ion Dewalts and some bigger 56v Echo batteries I have. Thanks for a clear explanation.