The quality is very apparent in the Kweld.
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110 percent go kweld.
I have read about problems with malectrics, havent heard of problems with kweld.
I am glad I spent the extra, love my kweld.
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Iām still waiting on deals on lipos to pop up, then I will be fully functional 
@Arzamenable Iām interested is how those cells preform, they werenāt recommend in the Kweld thread. Although I would be ordering quite a few of them for other projects so many so many P could be possible.
Lol I was on that site a while ago. That would be really good as a range extender for my Onewheel!
Iām looking for deals pretty much specifically on hobbyking graphene/nanotech for the Kweld. I would be down to use the spin08HP cells if they work too.
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5.8kg seems pretty good for a 1KWh, the 16Ah might be a better choice for weight as I would use something like this on a eMTB.
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That unit costs $600, the 6S one I linked is on sale for 50% off at $150 a piece, so for that price you could run 4 for the cost of that. Theyāre definitely mountain board batteries though, a little large for anything under deck.
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Yeah after I typed that I realized that one you linked was definitely good for eMTBās and way better KWh per $.
I guess the appeal I saw of those large enclosed ones is that they have a BMS and probably good construction, maybe meant to take a fall. Also 12S lipos packs like this are hard to find. For people that just need complete solutions. (Not me)
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Is that a IR of Hole battry after building the pack or individual cells before building it?
Can anyone point me to the smallest 12s charge only BMS? tight on space.
Back with more BMS questions.
I was bench testing the battery pack while waiting to get the rest of the components (aka waiting for black friday lol)
12s4p NESE 30Q
Bestech D596, 80A discharge
12 volt light bulbs in series for dummy load
Discharge and overcharge protection worked fine. I charged one p-group separately to get the pack out of balance, then put the entire thing to charge normally. The higher p-group reaches 4.21v, the other ones are at 4.12v, overcharge protection kicks in but the BMS never drains the higher group. Left it sitting on the charger overnight and the higher group still sitting at 4.21v.
Am I missing something? Is 100mV too much of a drift for it to start balancing?
How much amps do you charge with?
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2 amps, but itās adjustable up to 5
Hm, that should be slow enough to get you a bit closer as min.
The initial drift was 100mA or only after the charger switched off? Didnāt understood this fully
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After the charger switched off. I ended with ~4.2v on the high group and ~4.1v on the rest and it would not balance overnight.
Initially, I charged the individual p-group to 3.62v, the rest where sitting at 3.46v. Then I put the pack to charge at 50.4v CCCV at 2amps
(all voltages mentioned are at rest)
From 0.16V to 0.1V for one cycle is not too bad.
I would drain the pack once more down to 3.6-3.8V and charge again. The difference should be smaller than.
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Since charge % and voltage arenāt linear, idk if that actually means it did any balancing. Would be kinda hard to calculate.
I thought a BMS will just bleed the excess charge into a resistor for as long as it sits on the charger and until all the groups are perfectly balanced.
Does it only do that while actually drawing amps from the charger? So lower amps = more balancing per cycle?
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Idk how it is on the d596, but there are different bms out there. Some of them just balance while actually charging and some even just during a specific time, like from 4V-4.2V.
Thatās why I as well was referring to the charge current. The lower the current, the more time your bms actually has to balance the pack out (in case your bms works like the one I mentioned above)
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Individual cells. Those are cheater IR numbers tho, measured on charge. I think true IR is measured under high amp discharge
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Itās this kind of stuff that has me going to smart monitoring and external balancingā¦