DOA soldering iron doesn’t compute for me.
Just fix it, you have a soldering iron
Oh wait
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I can make a thread about the cyberquads in a min.
what about this little energy system though, is this the first portable battery made by Tesla?
why does that barrel jack look short?
it ships in a few weeks so maybe someone will tear one open then.
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Are you implying that Shua is lying then?
Just to be clear, Shua has already refunded me for it.
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I didn’t know this, and that seems like the proper outcome.
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Needing advice or life hack.
When I’m spot welding this 9p(5x4) how can I make it easy for myself to know where the welding area spots are? This is 0.2mm x?50mm nickel FYI.
The top row I can eye ball but bottom row could use some tips.
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Use the back of a screwdriver and press the nickel down hard, it will imprint the cell details.
The back of a sharpie works too
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if its for the positive side, I just take an insulator ring and stick it on there if the edge of the cell is visible. For a larger pack like that, it wont really work, so just try and push down the nickel so you can see the outline of the cell
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You can make a jig that sits on top of the cell-and-nickel stack and indexes off either the cells or nickel, with some holes in it that match the weldable area. Could be paper, cardboard, or 3d printed plastic.
And if you don’t want to deal with that while welding, just use it to scribe (or sharpie) the outlines onto the nickel.
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Can you share the file? I wonder if a staggered version exists
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Thank you for the guidance so far and the patience to review my work. Taking baby steps here. Any feedback?
Notes
- test cell voltage in 0.05 of each other
- used hot glue
- used positive terminal rings
- fish paper around the pack
- thin strip of additional fish paper where the nickel will bend
- kapton tape
- bound by fiber duck tape.
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Looks good! 
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There’s not much info on it, but has anyone seen this BMS? Flexi is out of stock and there are not that many alternatives in the same price range. Based on LTC6813.
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Doing my first commissioned battery build. Everything went smoothly besides some p-groups having a slight curve to them. I hope this doesn’t mean rebuilding this whole pack. It should look/be flat enough after the fishpaper and heat shrink.
Never seen someone use this. Maybe use an Ennoid BMS? they have a small charge only option, like the flexi.
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(Post deleted cuz it posted Preemptively in my pocket )
Hey anyone know where there is a step by step how to build a battery with diagrams and pictures, basic safety practices, equations needed to calculate necessary info, dos and donts, and most importantly order of operations. Or alternatively does anyone know a resource where I can learn this properly and safely. I plan on using a Nese but want to understand safety concepts to avoid costly mistakes $ and health wise…
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@Lee_Wright has some good building tutorials on his youtube page that will take you through a lot of the steps and best practices. Really though, there are a lot of little details that you won’t get from those videos. For e.g. choosing appropriate materials (wire gauge, nickel size/thickness, what kind of tape and glue or silicone to use etc…) If you’ve never built a pack before you should read this whole thread back to front to start. Then there’s the peripherals- proper soldering techniques etc…
Read this thread and then post your plans and wiring diagrams here for some feedback. If ur not prepared for at least a few months of homework, just buy a pack. Liion can be super dangerous. Like burn your whole house down dangerous.
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