The battery builders club

Can confirm that left schematic is correct and also matches the plug on my motors, that also worked on my unity. I think the side exit connector is just flipped.

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It’s backed by fishpaper. The foam is being used as spacer during assembly. Whole pack is covered by fiberboard top and bottom. And given the cramped nature of the enclosure I highly doubt anything will be moving around.

that gave me flashbacks to this little experiment lol

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I need LiPo charger expertise.
I bought 4 of these:


They are TURNIGY LiPo 6S, 5000mAh 25C-35C with dimensions of 2" x 1" x 12"
Plan to use them as 12s2p (might break em open to change the layout from long to stacked)

Is this charger any good for em?

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Please rate a most perfect parallel group :yum:

The positive terminal has a 3mm overhang over the corner of the cell to add some extra protection

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Ooh! What size shrink wrap is that?

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95mm flat width and cut to 65mm length, its super thin stuff. I bought it for my 3p 21700 pack but it works here too

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The stuff shrinks super well, once toasted it becomes 50mm flat width

yeah they are pretty good. I’m using that 600W PC power supply now instead of a 60W brick that I just posted last night.

It’s so nice and silent :no_mouth:

It actually got me thinking if you could charge a 3S packs directly from some PC power supplies, they would charge up to 12.08V or 4.02V per cell.

oooh 4S lifepo4 :shushing_face: only 3V per cell no bueno

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Someone show me a dozen parallel groups that are nicer than these :yum:

V1.1 (couple 1.0) linear layer 3p 30Q FoxBlocks, you saw them here first folks

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That is beautiful!

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hell yeah, nice work dude. Love the logo

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You have no idea how much I like that everything is all shades of grays and silver…the OCD in me is like :relaxed:

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Hey guys looking for help with a malectrics spot welder. It’s brand new. Pre built. And I can’t get it to work. Ive tried auto and manual with the pedal. Every time I try to weld it gives me this…

I need a sanity check on the wiring for this balance BMS that I intend to bypass. I don’t have any wiring diagram that came with it but I assume it’s standard as I see this BMS used often.

I know how to wire up the series connections, I just wanna make sure I’m bypassing it correctly.

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How do these look? 18ms they hold great to pliers

Corners: sharp
Shrink wrap: shredded
Welds: not bad, maybe a little cold? I think your pressure is uneven

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Cool. The cells are for test only. Wraps and corners will be good on the 21700s. I’ll bump it up a little and retest

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Is it ok to solder my balance leads onto the positive ends? Last battery I didn it on the negative but I set this one up to be on the positive ends without really thinking about it. Wondering if that’s ok?

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It’s better to do the positive ends IMO, because less heat makes it to the inside of the cell.

Less thermal mass, too, for easier soldering.

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