My bad. https://liionwholesale.com/collections/batteries/products/molicel-npe-inr-21700-p42a-45a-4200mah-flat-top-21700-battery-authorized-distributor?variant=15913210675294 they are sold out. I got an order from them in 3 days.
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yeah shipping is fairly quick last time i ordered a few hundred of these they came in 5 days
How did that split parallel group go?
This is just personal preference but maybe wrap the whole thing in a single piece of shrink wrap to keep it tight?
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it was annoying to solder the split P group. Had to maneuver around and stuff.
Itâs already so tight I donât know how much of a difference shrink wrap will make. I would but I donât have any atm.
I mean that depends on how the supposed 40T revisions are. But I imagine the old stock will be around for a while so itâs not like we can guarantee new ones, so probably the P42As
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where from? how much?
in general whatâs a fair price and whatâs overpaying for p42a? 80 - 100 cells.
Iâm getting close to pulling the trigger on ordering some cells. 
I bought the Malectrics spot welder from their EU website, 129 EUR with shipping to CA. Lipo version but I also got extra car battery terminal clamps and a few other small spare parts.
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How do you charge just 1 p-group in a pack that needs to be caught up to the other so all will balance without dissasembling the whole pack and having to re spotweld it all, or is that my only options.12s5p 30q pack stacked the tall way with folded nickel for series connections.
are you going to use 4cell packs and plug them in or individual cells?
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If the wiring up to the balance connector is good I get in throught the balance connector with a bit of tinned 20g and an alligator clamp to a hobby charger or whatever 4.2v source is handy. The wire is small so 2amps befory things get warm. In this case, the wires broke just before the connector, so I just re-crimped and equalized the groups manually, test bms function and done. @KaramQ hows the battery holding up?
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4 cell packs. Already glued together and fish paper on the ends to seperate P groups
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Make sure you clearly mark polarity so mistakes donât happen
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donât be stingy in your build⌠red=+ black=-
even on the BMS leads at either endâŚ
2 cents
even then double check
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Weld another thing of nickel as if there was another row of cells, rough up the side that would touch the ghost cells, strip some wire (this will be your discharge leads), tin them and the nickel, âtackâ and âweldâ (like doing TIG welding) using solder
This was the first pack I did that for, but Iâve done it on 4 different batteries, every one gets a lot neater and faster, and none have had problems
If your soldering isnât good enough to do it while the nickel is in place you can solder first then spot welder, I find it a bit more effort to work with but thatâs because I donât have a pen for my welder
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pretty much what @ZachTetra said.
I use braid soldered to the last strip of nickel belt, folded over the side.
On the (+) I even fold the fish paper over the edge of the can for extra insulation on the business end of the pack. then solder the leads to the braid, shrink wrap the solder joint before insulating the rest of the pack
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