Oh huh I just ordered straight strip bc I still don’t know how I want to configure the battery for my hummie yet.
I know I want double stack so I can do 12s6p but not sure how to lay it out yet
what cell?
I have a single stack hummie to do here soon with some HG6’s (20650), but I think the only way to get batteries in that cutout without using a router (21700’s don’t fit) is to put the series connections on top like this:
12s6 double stack will probably leave plenty of room under a DS enclosure.
They’re 30Q cells, so I should get plenty of performance out of it and hoping for 30 miles of range.
That pack you linked is definitely unique lol I think I will just be doing the standard 6 cells in parallel double stacked, 12 in series, in like a loop. Yknow, standard. I will probably be trying to make my own enclosure for this build bc I have literally no limit on the timeframe really, it’s not urgent at all.
1 Like
What’s the best option for a high discharge lipo for a spot welder that I can get on short notice? The 6Ah Turnigy Panthers seem like the best option at the moment? Will get either a Kweld or Malectrics
I run 2X of those I’m parallel for my kweld. They don’t get hot at all but using only one of them it will get hotter than I’m comfortable with.
Going slower keeps it cool right? I mean, how slow do you have to go? I built a 3s3p out of SPIM08’s after hearing about @Arzamenable’s experience with a 3s2p pack he welded with. The 3x3 welds great and doesn’t heat up at all, and I put it together with rivets and some “upcycled” aluminum strap. the probes get too hot hold way before the battery does
3 Likes
Of the 6Ah ones? Is there a better option for under $100?
Also recommended chargers?
Yeah the 6Ah ones. They heat at about the same rate as the electrodes do, if you go fast. But it’s much easier to cool the electrodes than it is to cool the lipos. I don’t like switching tasks and wanna weld for hours on end… lol.
1 Like
Maybe flat pack them or something for better heat dissipation?
2 Likes
They’re comfortably warm in parallel. I’m not worried about it.
1 Like
Hmm… So just the one 6Ah might not be enough or can I do it with slow welds?
Slow and you should be alright
1 Like
I’m thinking some funny things like 12s6p 21700 (40T or p42a) in a prototipo with an enclosure spacer, custom 3d printing some kinds of battery holders to help.
would end up with 10-15mm of spacer needed to include padding and wiring room.
here’s some rudimentary mock up:
i’ve been waffling between do something unique and interesting… or do something more standard. (12s5p no stagger ) originally wanted 150% more wh from stock. 10s5p 20700b. but I have another commuter board now so I could let this idea go. so I keep waffling on how hard I want to challenge myself.
looking for opinions.
1 Like
Honestly I don’t think that staggering is the move, if you are really hurting for range get a top mount pack. Also P42A all the way
I mean it will work but you loose out on padding and easy wire management, plus making it will be a bit of a pain when it doesn’t have to be
I suppose you can also try QB8600 cells? They might fit
1 Like
Working on a project I thought up.
I wanted a way to travel on an airplane with my board.
I also wanted a 12s4p from molicel p42a.
I came up with this…
4p glued together using 21700 nese hardware.
Direct solder balance wires and series connections to tabs. Use 10awg to connect series allowing flexibility between P groups.
Planning on using black RTV to secure the nese hardware to the enclosure.
I am planning on using a friction fit for the cells to stay in place. Then closed cell foam on top of cells to take up the rest of the space in the enclosure so they have no where to go… roast away…
thoughts: nese bolts together to provide connection pressure? this friction fit could be too loose?
@fessyfoo I’m clamping wooden template blocks to the nese tabs that are a little bit shorter than the cells. Using the RTV silicone it’ll have a little bit of give. I should be able to find a good distance/pressure to keep the cells seated. There’s not much room for them to go anywhere but up, and that’ll be covered in foam and bolted down…
1 Like
where do people get theirs? they seem to make for quite the expensive pack. and they’re slightly larger I hear. closer to 22 than 21 diameter. also 40Ts. or P42A at 5 or 6P could botth do 120A which is as much as the unity i’m gonna use could handle.
Also @PixelatedPolyeurthan game me this trusted opinion:
2 Likes
Wondering if anyone knows how I should charge this battery, says it’s a liion, but only has a possitive and negative terminal. Would a 12volt trickle charger work?
It’s an Lg Chem battery I got from battery hookup. I think it is used in some evs
3 Likes
Follow this dude for battery porn
6 Likes