Just wanted to share my modified nese setup.
12s4p molicel p42a with nese tabs, no 3d printed parts at all.
4p groups glued together that can easily be popped in or out without having to mess with wiring
5 Likes
What’s the spacing between the tabs? From one parallel group to another?
1 Like
@mishrasubhransu do you mean the gap between p groups? There really isn’t much of a gap. There’s double fishpaper on the end cells of each P group that touch. Here’s a pic of it with all cells
I can probably squeeze a credit card between them if I had to.
1 Like
Gap between the tabs meaning the distance between the planes of the tabs. I meant the other p groups, the ones connected by series connection.
I took total cell length minus the button top and subtracted .25"
Nicely done! 
How are the 4P tabs held in place? If they moved towards the center that would be bad. Do you have any kind of spacer between the 4P tabs?
The 4p tabs are held in place by black RTV silicone. I ground down the edge of the tabs that meet in the center to give more distance between p groups. Then I put some black RTV in the gap between the tabs. The tabs are almost impossible to remove. I had to redo one and it was hell getting it unstuck
2 Likes
Some news.
18650 and 21700 V2 is finished. 26650 is also done and die with first batch will be ordered soon.
Good news is that 18650 and 21700 will share old 18650 series bus bars. 26650 will have their own.
18650/21700 bus bars are ordered and in the making so its not long till i have them in stock again.
I have started working on Makita tool battery. The design will use original Makita lid but will take 2 to 8 cells and will be rebuildable many many times. It will use ultra thin modules at 18.5mm.
So far the design is made for older style PCB’s without management but i will get the new ones done as well. I am still early in this and its a teaser, nothing more, but its good to share stuff with people to get some opinion.
Sure it will be larger than original but its rebuildable many times and some tools like lawn mowers dont mind that. 6 to 24AH Makita battery would be dope 
Oh, and it should use original charger too.
This is 4P(12ah)
I am offering 35% discount for complete modules till old stock lasts. Contact me if you are interested.
12 Likes
How does v2 improve over v1?
Thinner. its 20.5mm vs 22mm 18650 and 23.5mm vs 26mm on 21700. Added some airpockets to shave few grams, made them 0.6mm wider at 75mm to rigid up sidewalls(the thin part) and added larger chamfers at the front to shave more weight and add space to run some BMS wires in certain configurations of the battery.
Now you can build 15S V2 battery in 14S V1 space(18650)
4 Likes
Just received my order, I wish I had known this! And the discount! Still happy with the product though 
@Agniusm have you considered making stacked tabs?
4 Likes
Yes, i did. They are not that flexible in terms of what people mostly need. Also doubling up will double the pressure on the sides and its already at 2.04kgf/cell I consider the value it brings and then demand vs cost of production. Like with 26650. People say they need them but in the end only few orders will come. I went with them only to have full range of mostly used cell sizes, to have broader choice for my customers but it will take very long time to pay back.
You can make plans for another board 
People are ordering constantly and i cant have my shop suspended to prepare for updated version. I know its a bitch situation. Look at the bright side. With shipping going frocked up all over, you have it in your hand 
Nice! Sounds like a great progress. Will the new design still be OS? Do you have any pics?
OS - open source? If so yes, i will get all sorted and published on TV. There is not that much of a visual change other than front chamfer that is deeper. I will get a photo.
1 Like
Does it work with their charging system as well? I had to repair one of my father’s batteries (replaced the cells), but afterwards the charger would refuse to charge it. Also found it interesting that the cells did not have balance wires, only a single one, which I guess was just low voltage input for some circuitry 
1 Like
The circuit boars counts the cycles or voltage. If it gets below threshold it bricks the battery. This is the old style battery. The ones with gauge has cell level monitoring and balancing. You can get first gen replacement pcb for 4 bucks and new bms pcb for arround 12 bucks on ali. It uses makita charger.
3 Likes
Great work @Agniusm! Happy to see the 26 size added and the other sizes loose volume!
If you plan to further develop this platform, I would love to see some double stack versions. I think double stack 2s modules might become quite popular.
Edit: It would also be cool to see a version that allows to carry heat away from the cells (with an alloy plate on one side, going to the edge, or similar.
2 Likes