+1 on double stack. I’m probably going to try to stack up the current modules. Being able to shave off a little bit of the height would be nice.
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Trades people will love that, being able to just switch out the cells make it really sound investment
Plus huge market, congrats
Do you plan to design your system only with makita batteries in mind or will it fitt Bosch, Dewalt, Milwaukee, HiKoki/Hitachi, Metabo batteries one day, too
I need this exact thing. Tell me MOAR!! (mainly about how to get my hands on it)
a double stack would be amazing
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Doublestacking could be made now. Its just a matter of cadding enclosure.
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I will see how it goes with makita and if all is good i dont see the reason why i should stop there 
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I need to get my hands on the bms pcb. Atm i have made it for old style charge board.
That sounds like a dream to me.
I want to fit two rows under 40mm.
Your new design sounded so close to my need, but a double stacker sound like it would work
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I have done makita specific modules which could be adapted and they are 18.5mm but they are open style.
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but still using your solderless tab system?
+1 for DS enclosures
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Yes, same.
Just an update, it took 44 days for me to receive my stuff in the US with the current delays.
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Hi guys, I am also thinking about creating a NESE battery pack, but need a more densly packed version. I was curious about the mentioned double stacking and wanted to find out the possible space reduction:
If one puts the modules together back to back with an overlap of 5mm, then the resulting height would be 39mm instead of 44mm. The tab ends are pointing to different ends so the length of the double module doesn’t increase much. This is probably a disadvantage in some configurations and might need different bus bars?
The good thing is that the tabs and lids remain the same and you could easily open the module from both sides.
Not sure if the resulting thin inner wall would be thick enough to still ensure good compression of the cells. If so, then it might also save material compared to two separate modules. If not, one could still try out an overlap of only 4mm.
Note, this is V1 of the modules. If I am correct, then the V2 modules should shave off another 1,5mm to a total thickness of 37,5mm.
Curious about your thoughts on this!
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It all looks good but, when designing something, always think how you gona produce it. My design rule is always no supports when printing, all angles at optimal 45 degrees. If someone want to test, i can send my cordless tool module files. Stacked they should be at 37mm tall.
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Thats a good point, I didn’t think about that. Then your compact cordless tool version would definitely be the better, more flexible option. Are they available in 8P for both 21700 and 18650?
Would be interested, this is for the Makita pack, yes?
Still working on makita. Got new version bms for makita so i need to design mounts. Old pcb version is ready. I will most likely make Dewalt XR and Milwaukee M18 as well. There is still a question on the bus bars. If you do have dead batteries i would hold on to them.
Dude what type of bat holder is that? I need to do a 12s 5 to 8p for my 90kv* motors in 4wd drive set up. So i was thinking NESE but that looks different than NESE. An i have been told that i cant build a 12s 5-8p battery with NESE because they will take up too much space.