M18 21700 Aftermarket Kit w/Molicel 4200mAh Cells

04:36 I could be wrong, but I think you're supposed to put +ve and -ve probes on opposite sides of the split. That way most of the current goes down through the strip, into the cell top, then back up on the other side. The way you're doing it has most of the current travelling horizontally through the strip, so it doesn't bond as well.

Thanks for showing how to change the settings on that spot welder. I didn’t realize they had made it so much more practical to use on that model. Definitely puts that model above similar ones I’ve seen and used.

Very nice. I just built a 2p Makita w Lishen 21700 cells and a DeWalt 2p with harvested Samsung 30t... Have some harvested molicell 20700 from dysons in the que. Great time it is to have these nice kits to build great packs at less than half the cost.

Interesting that the non genuine board charges each cell to 4.08V, the genuine Milwaukee boards generally (depending on the model, eg 12aH pack) charge each cell to around 4.15V with balanced good cells. Doesn't seem like much but adds a significant amount of capacity to the pack. As toolscientist pointed out, you're spot welding incorrectly, should be across the split, that's why the split is there, to improve current flow through the weld points.

Great video. Any experience with the Hart 40v 6ah battery pack?

I’ve had a theory for a long time I’ve not taken the time to prove, that the charger continues balancing cells after it says the battery is fully charged. It’s because the charger leaves the fan on and continues to draw power after it reports the battery at full charge (I’ve checked both Makita and Ego chargers this way). Is this correct? I think this since while rapid charging I don’t see how the board can adjust for balancing cells while pouring high current to them. I’ve also noticed a peculiar behaviour of my Makita rapid chargers; they constantly fluctuate between about 120W and 220W while charging. Seems interesting.

Looks like no thermistor. Have to be careful if pushing it hard. Would be interesting to see how they've done the low voltage cutoff. Hopefully they're monitoring all the cells. 4.08V per cell seems a little low for fully charged. Pretty sure I usually get 4.15V after charge.

Both Amazon links out of stock or been taken down 😢 must been your video but still available on aliexpress 😅 BTW extra nickel plates available by themselves as well suppose u could double em up

Hi been watching your videos very interesting you have watched this one I need to replace my 5 lithium ion battery’s x 5 as most are dead. The batteries are INT 18650- 15L Samsung SDI 120 any information wold be very much appreciated. United Kingdom.

Too bad you didn't purchase the p45b cells!!! They are superior in almost every metric.