BatteryHookup.com are we talking about this?

These A123 pouches look pretty good actually.

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I am definitely tempted by these Tesla Model 3 cells at $3 from Batteryhookup

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Not sure on the temptation myself - they’re 2c discharge recommendation, not sure what the actual continuous discharge is going to be and because of that its hard to really be interested other than the price.

BHU is sometimes a bit conservative with their ratings. I think they are rated for 15A continuous, and they certainly can endure higher peaks and some good charge rates, after all, they are used in a well-performing EV.

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I dont think there are any official numbers on these cells are there? BHU always posts conservative numbers and thus far the testing I’ve seen out there has been pretty casual. I haven’t seen anybody reputable really put them through their paces with accurate equipment yet, although if you have, I’d love a link?

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I agree, and we can infer some numbers by comparison to similar 21700 cells, these are gonna be somewhere between 40T and 50Es, but the Tesla cells historically have been a bit better on pushing amps for their capacity.

15-20A continuous sounds about right to me, and 25-30A burst seems easy. Should be a highly economical middle ground between the 40T/p42a for more cap in less amp hungry builds… I’d think these would be killer for range on street boards.

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Exactly. In essence the 21700 version of the 30Q.

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That’s my problem - no information out there on if these cells will perform well at 15amp as its all assumption, which means by the time we (specifically I) get any details, these will likely be long gone. I primarily want these for my current build which is a mountain board. If I had a street only board i’d not concerned.

But silver lining :slight_smile: if I cant be convinced it means there’s 100-300 more cells out there for one of you guys.

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I get that for sure. Personally I’d be hard pressed to look at anything other than 40T or p42a’s for the build you describe. I’m going with p42’s for mine, $4.7 each is pretty hard to beat.

That said, I think I am gonna take a chance on these model 3 cells for a street build, and hell, may as well see how hard we can push them.

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And this is how I ended up with 500 of these cells.

This is everyone else’s fault but my own.

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Ahh the advantages of living in a society that’s progressively rejecting the expectations of personal responsibility… It’s a beautiful world! Amiright? :grin:

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^ This guy gets it.

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Who’s taking the extra 100 from ya?
I am assuming you got a fat ass order of 600…

Oh and good enough timing for your PCB kits!

It’s all coming together nicely :stuck_out_tongue_closed_eyes:

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Screw you guys, these are for my own dangerous plans.

I dont think they’re well suited for anything less than 8p anyway.

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This would be good for like a Electric Chopper.

Shame it isn’t 22S for the 100VESC but the cells in these packs can be separated in twos I think so it could be taken down to 22S prob.

FOund a couple videos on youtube of people reviewing these cells from bigbattery.com and I noticed a slight discrepancy. Screen Shot 2020-08-09 at 11.34.52 AM

image

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If you rate it 4800mah = 17.28Wh

If you rate it 5000mah = 18Wh

18.5Wh = 5138mAh??

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I guess I’m wondering, are these companies making their own estimates for these cells and printing their own different wraps for them? Or what’s happening here?

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I would imagine it’s just different tests at different loads maybe?

or just bad info… I think we will have to do our own testing.

I feel like I want to see the voltage sag on only a 12S4P. This is the only way to get actual high loads on them. I bet they work great in 12S6P+

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