Hello, This is an eight by two lithium-ion phosphate battery using these six amp hour cells with threaded studs on each end. And I've got my uh, Four Hole Cell Connect boards on here. I'm just going to break this in half because I'm going to build a 4S battery just to do some experiments. So let's take off this middle board which will allow me hopefully to split this pack into two 4S 2p packs because there are the cells.

These are the positives and these are the negatives. Okay, the way I've done this is I need to split those that way. but I need to split these that way. So on one side of this, they're all going to have to come off.

I'll do that now, right? That should let me split the pack here like so and then I should be able to slide that off there. Okay, so that's two uh, 4S 2p packs. So let's reassemble the board on there. So I've got this um board sticking out the side like so so that would be the most positive.

That's the most negative. this is the midpoint and then the other two connections are on these boards. Um, so I want to make this 4S board because I want to try out a new BMS I've got. actually that's an 8 Spms isn't it? But I've also got the cell balancer.

So I thought I might give this one a go which has these wires ending like that? so I can see how effectively this one works. and if you remember my super capacitor with the voltmeters, uh, this one is actually still at 1.8 volts and I was charging that last night. so that's gone all through the night and gone from 2.7 volts down to 1.8 So these meters, these voltmeters take very little power and I just thought for convenience, I'd put them on Jst. Oh, they spin.

Yes, that's uh, slightly annoying. but I put them on Jst two pin connectors like so. so I'll take one of these off and I'll show you how I've fitted that. So I've done a little bit of internal wiring on the 1.5 volt input and the ground brought those around I could get this, um, screw out of here.

couldn't I because that's not really helping me I brought those around to a Jst two pin socket and then just put hot glue in there to glue that in I've also wrote the voltage that I measured on my reference a cell my little lithium-ion phosphate aacell. So yeah, with these sockets, it's just a bit more convenient because I can remove these from the super cap. I can plug that back into the Super cap now and that shows the 1.8 volts. I've also slightly cut away the little arms on these Jsts because I've always felt Jest is just a bit tight, aren't they? So I was just cut those off in there so that you can get the Jst out a little bit easier.

And these, of course, I'll put four on my dad's office board here so I'll make up two more of these and these are just cut up bt168. Pro is actually not the D the pro um, just the top left hand corner of them rewired so that I've got this oops convenient plug. So then I was thinking how do I connect everything to this and I was in the shed and I saw these angle brackets which I bought from Aldi and I thought if that went on there and then another one went on this side. coming over this way, it kind of gives me all my intermediate and endpoint connections across the middle here across the top which I thought might be quite convenient and so I could put these banana sockets these terminal posts on one of these screw it onto the board.

Now what I really want is for this to mount in the middle of the board like that to give me that connection which is an end point on this battery and then I'd have another one of this is actually a bigger one, but you can see how it would work which would come across like so and then you'd have all the connection points on the top for things like BMS balancer and even the voltmeters. although the the Jst wires are very thin and they're not really suitable for banana plugs. and so what I thought is Let's Make a new PCB here which extends up to a third row and then has some sockets in the middle or some holes in the Middle where I can mount this bracket so it'll sit up like that. Um, and then everything's plug and play and I can try different balances, different Bms's and all that sort of stuff.

So I've actually worked on a new board now. Ultimately, this battery is going to have 40 cells because it's going to be five cells high by eight cells across because it's going to be a 25.6 volt battery. So I've made a new board which is actually two by three and so that will cover the first three rows and then another board will cover the next two rows and have a bit sticking out the top which will enable me to put all of this stuff on. so let's have a look at that.

PCB So here's the board. It's um, two cells wide, three cells tall, and you can see I've got a couple of mounting holes here for, um, the angle bracket which means I can put banana sockets terminal posts on there now. I've done spoked holes for the cells with the sort of idea that these are fuses I've made them very large actually, so they probably wouldn't work very well as fuses I don't know, maybe they blow and you've got to remember because they're on both sides because this is a double-sided board. Um, so yeah, all the cells are effectively fused into this back plane.

I've also peppered it with Uh wires to sort of connect the two sides together at positions uh, in addition to the Uh through holes here. So when those Pcbs arrive, I can fit them onto here, connect up these little voltmeters four of them to the four cells, see what the voltages look like, then sticks some banana plugs on the end of these wires of the balancer. I'll stick a load on a couple of the cells to sort of unbalance them with the other cells, and then just see how effectively the balancer brings all the cells back into balance. But those are my thoughts currently for my new battery that will ultimately go in the shed and be charged by solar.

That's it for this video Cheerio.