For quite some time I have been doing repairs/rebuilds on the 5 & 10 cell packs (Makita, DeWalt, etc). I was given a Kobalt lawn mower, 40v with a dead battery. I found two dead cells and two very weak cells. I had comparable batteries available...so to work I went. I spent several hours trying to get the end cap off (after removing the screws that hold both ends together). I was at wits-end. After looking at a lot of useless videos (which is usually the case) I came across yours. I fast forwarded till I saw where you removed the single screw that holds the end caps together on each half. WOW...

You do such clean work, and you're great at explaining your process! Please keep the videos coming

I really enjoy your videos and your thought, trouble shooting process, I allways learn something new and like Scott Bakula says on CSI New Orleans "Let's go learn things".

Great video! Thanks for being so detailed and very cool to help out a neighbor!

Awesome clear explanation and useful pointers! His videos also double as ASMR! I greatly appreciate the fact that you are a gentle soul! ✌👍

well done. I will rebuild my batteries.

Thank you for sharing this video

Nice job, I learn allot for ya.

Good sounds great view battery box. 👍

Thank you for the video it Helps

Great video thanks and I did order one of those little spot welders and polymer battery,

cool I like the welder.

Great job 🙏👍🙏👍

Recently popped one of these open & was like dang they really going to make it this easy to make a 4ah pack. Even if I don’t rebuild it for the Kobalt I’m going to save the holders for other projects, way too nice to just toss. All of the cells were roached, I think as 1p setup the tools must have just too high a discharge for the cells to last long, 2p should make for a much more reliable long lasting pack.

hi, i think you are the best person to answer my question. You explain well and have a lot of experience. I have recently had fun restoring old power tool batteries. what always amazes me is that one or two defective 18650 cells and the battery is not functional. is there a way or modification for the batteries to degrade at the same time? I saw that there are active balance... would it be the solution?

Bought a bad one at Goodwill to salvage cells from but all were bad. I don’t have any Kobalt tools so rebuilding it won’t do me any good. Would you like this shell/control board? Perhaps your coworker would like you to build him another 4AH pack.

Hi, great video. I have an 80v that all the cells test 3.78 - 3.83. charge indicator shows 2 lights, but it won't charge. When put in the blower it runs for 1 second then shuts off, after a brief time, it will do the same thing. I can't figure out what's going on. Any thoughts?

Great information!!!! So no need to change the BMS going from 2ah to 4ah. I have a few 2.5ah I want to go up to 5ah so they will last longer in my mower . Do you thing that will work? Thanks .

Thank you for the video, it's helped me take mine apart and somewhat understand what's going in there. However when checking my cells they seem to be okay. I have a 5 amp hour pack and so the way they're wired I can only measure two of them that are together. When I measure each set of two, they're all very consistent at about 7.6v. Before I took it apart it would charge up to 2 bars and then the charger would start flashing red. Any ideas? I guess if I un-solder the cells I can check them individually.

what kind of cells did u put in there my moms battery is going out was going to try a repair