The battery builders club

Like this for flexi pack?

OK, thanks. Got most of that except the independently grounded chargers, what does that mean? Wouldn’t they be connected to the same ground /earth?

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That’s lookin right now haha

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Yeah you need to make 110% sure that the charger ground is not tied to AC ground. Three-prong AC chargers are often tied to AC ground. Two-prong chargers often are not. In EU, two-prong chargers are never tied to ground in their output side, but I think US has some weird wide-narrow arrangement in some two-prong plugs so you have to figure that out yourself.

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12s1p with p42a batteries

@ApexBoards can help you out with that. I’m not impartial. :grin:

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Can someone tell me what mode bestech this is? I’ve found similar ones on their site but not exact ones. This is out of my lacroix jaws. Planning to build a bigger pack

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Just use a smart bms externally. Easy and cheaper than a good 12s hobby balance charger.

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http://www.bestechpower.com/444v12spcmbmspcbforli-ionli-polymerbatterypack/PCM-D606.html

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Is that easy to do if the board isnt a topmount mountainboard?

I do charge my Tayto with it.
Give me a minute I’ll mount it up

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Like this

Ignore the missing and not fitting connectors :joy:
In theory you could just make one 13pin balance plug instead of two 7pin plugs
I used. Just was more comfortable for me as like this I can as well charge my 6s lipos.

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Very nice

How tight was the soldering job on the 7 pin connector?

Easy. Just solder first the wires to the plug and than to the pack,
or use a jst connector in the enclosure between the pack and the plug.

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I saw that one but it looks slightly different

how we looking so far my dudes?

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looks good, maybe a little toasty on the nickel to nickle, maybe just the picture.
what cells are those? and how are you going to make the series connections? you don’t want too many angry pixies moving along that nickel bus…

also, I saw your thread looking for a bms. I have one I can part with if you promise to make a build thread :wink:

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Yeah I burned through on a couple of the nickel on nickel welds, I’m using 0.15 x 8mm and turned it down to ~25j but I think it’s still a tad hot. They’re 30q’s in 12s5p, I was planning on using 3x 14 awg silicone wire for the series connections but wanted a sanity check before moving forward.

Here’s my ongoing build thread: the Ba'al Buster :: Demonseed 42 :: BN 270 trucks, mounts, baseplates :: TB 6380 190 kv :: TB AT :: 12s5p 30q :: ESC = who knows?

I figured I’d get more targeted battery feedback here but I’ll document actual progress there.

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that’ll be plenty. sounds like you did some homework :+1:

nice work on that build thread, pm for that BMS :+1:

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how should I solder this; I can’t find a way to hold it steady