The battery builders club

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

you should use a crimping tool

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and if I don’t have that what can I do, directly weld the tabs?

you mean solder? idk if it sticks yeah but you’ll need a soldering iron with a big thermal mass

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Get a screwdriver and a hammer. Shove the wire into the lug. Put the screwdriver near the end and hammer down just until the wire is held in. These turn over and do on the other side. Now once its held in, lightly hammer the rest of the lug until the wire is VERY firmly held in place. Don’t just smash the lug repeatedly, you’ll break it. Just hit enough to get it to deform

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Pliars and a rubber band should be able to hold onto the crimp. Hold the soldering iron to it for a whole and ‘fill’ the hole with solder. Insert the tinned wire and wait for it to all melt together

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I read a bunch of the net on crimp vs solder vs crimp and solder I came away thinking opinions really vary.