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1) Where can learn more about batteries?
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All right, this video is going to be to show you how to use this board and this board uh, but first a little bit of background. These are the 4s lithium-ion phosphate modules right pcb modules. This is a printed circuit board, designed to make a 4s battery. These cells are connected in series and when you do that this becomes 12 volts right and they come out through here and then through here, and i made a video instruction, instructional video uh, showing you how to use these and how to put them together.

How to build them into packs sort of like this? You can keep stacking them right, you put them in here and you stack them and you can keep going and then you can even use the stand alone. Uh bms right! So you put this in here and then that becomes a zone pack battery pack. That is bms right. So it's got a uh battery management system in here.

So this is standalone pack that you can do and you can build many of those sort of like here and then you can connect them in in series or in parallel to make larger battery packs right. So if you put you know, four of these or three of these together put its own bms. Then you connect these cables all in on parallel. Then you just make three battery packs 12 volt battery packs into a one larger, stronger battery pack right 12 volt battery pack.

So so that's the one way you can do it, but there's other easier ways of doing it. Like, for example, let me show you this board. This is where this board comes in. This board is the same as this, but it's larger to be able to help you do this easier right, so you don't have to get a bunch of cables and adapters to parallel and do these put this in series or in parallel right.

So this board right here - it's already ready to go. It has all these traces that will carry the current uh into two cables here and why two cables - because these are rated around 50 amp - continues right. So this is bms for a hundred amps. So two of these will carry a hundred amps, no problem, a single one won't do it.

So that's why we're running too. Now this also we could. I could also chose like a bigger connector that can handle a hundred amps, but there's not too many connectors that that can handle 100 amps. So these i we're already using these and all kinds of other projects and stuff, and so putting two was just easier.

So that's why these are here right. So let me show you how to build this right. As you know, you know how to build these stacks right, because you already watched the other video, and here we go. This is the first stack.

Second stack, third stack and four stacks, so these are 16 boards right all at 12 volts and we're gon na put all these through this board right here and then make a big battery pack. So they all have the be the the standoffs here right and what you'll have to do is put it through this thing this is going to be the topper, so there we go. They lined up here. This one doesn't line up as good, but there we go so now.

What you do is you use the nuts? These are m4 nuts right. Okay, we tighten those just be careful and don't over. Tighten these because you can, you know, mess them up so now. The second stack goes on here: okay, now we move on to the third one: okay, when you're doing this, you have to be careful and not touch this one to this one or this one any of the adjacent uh posts here, because one is positive and the Other one is negative, so if you short those out, if you touch it with something in the cap metallic, like your thing here, then it'll spark and you blow a bunch of fuses and you short it out until you start you'll start all over again.

Okay. So here's the final fourth and final board: there we go all right. So, finally, the final step is to put the ribbon cables right. You start from the top, and then you put the first one on here.

There we go all right there. We go okay, something to keep in mind before you you do this is that all these boards have to be of equal voltage right. So when you before you put them in this board, you can check them to see what voltage they are right with the multimeter, and you know this ones are 13.37 they're all about 13.37 and so their their balance right and so the better balance. They are the easier the bms will do its job and the quicker.

So you won't uh, you won't kill any cells on the first time. You use it right um. So here's the thing to know to to figure out if the, if everything's working all you have to do, is measure that as 13.37 right there we go 13.37. That's what the thing say here and now, let's check the final cable here.

13.37 now you should be able to put a load in here and charge this battery and discharge this battery all right with 16 modules. Here you you're going to be able to do 5, amps per module, so 20 amps per stack right so 2468. So this can put out about 80 amps before all these fuses start blowing right. So when you put a load in here as long as it doesn't reach more than 80 amps, you should be fine.

Now, if you want to do 100 amps, which is the capability of this pms, then you can just keep adding boards, you can put them on top. You can put them on the on the top or on the bottom. It doesn't matter like you, can keep building this uh in many different ways as you want right. So this is that's the cool thing about these batteries system.

Is that it's modular and you can do you - can build them in many many different ways right as long as you just keep doing certain things like adding the right amount of ribbon and other stuff use the correct size of the standoffs here. These are 30 millimeter. Um and that's it - that's how you use this board right here. This is the 12 volt version of this and we have a 48 volt version.

This one works the same way. You basically put the same four stacks of boards right and then you screw them on there on top and at the end here, you have 48 volts, because this one connects them in series as opposed to in parallel with that right, and this one also will do What 60 amps yeah discharge current 60 amps charge current 30 amps, so you can charge at 30, amps, 48 volts and discharge at 60 amps and this one's 100 amps just because the voltage is lower, but about the same amperage right. So you'll have to put enough boards uh to be able to do the 60 amps on this one. So there you go, you can find these at

This is a super easy way to build lithium-ion phosphate batteries in multiple voltages, like this 12 volts or 48 volts sort of like this one uh. Thank you for watching this video we'll see you guys on the next one bye.

15 thoughts on “12v and 48v LiFePO4 26650 cell building kits”
  1. Avataaar/Circle Created with python_avatars MrLandphill says:

    I am trying to "build a better battery" for my 24v Neuton CE 5.3 battery lawnmower. it currently uses 2 12v 10ah lead acid batteries, the charger has no brains, it just dumps 24v 1000 ma to the batteries. the motor specs are
    RPM 4300
    Tip Speed 16,000 ft./min.
    AMP Idle 4 – 5

    AMP Cutting 8 – 10
    Size 500W, 24V DC/32 Amp
    Noise Under 80 Decibels

    The battery pack is made up with the 2 12v 10ah batteries oriented side by side. do you think a couple of your battery stacks would fit side by side in the space of 2 12v 10ah batts?
    Dimension(LxWxH) 151mm (5.91") x 98mm (3.86") x 95mm (3.74") each? thanks Phill

    also should the current charger work?

  2. Avataaar/Circle Created with python_avatars TecSanento says:

    I bet This is Only Version one of the System ?because it looks less sophisticated then the 7s 18650 Module – And you should Definitely put prominent Labellings of the System Limits onto it 🙂

  3. Avataaar/Circle Created with python_avatars Laura W says:

    I know I'm a newb, but it would be great to have some 101-level application-specific builds. For example, how to build a complete 12v pack to replace a typical automotive deep-cycle style battery, including hooking up to inverter, and charging. And charging with solar. I'm wanting to replace typical deep cycle battery in RV / camping application. Thank you for your videos and furthering the cause of rechargeable battery re-use.

  4. Avataaar/Circle Created with python_avatars Ric Desan says:

    This is a huge step in the right direction to using LiFEPO be would ultimately be ideal if you could adapt the PCB to a 24v setup design as well. You designed so many other systems in 18560 land to 24v

  5. Avataaar/Circle Created with python_avatars draglorde says:

    you do not need certification before selling this?
    What happens if someone starts a fire and says that it was due to your boards? (I hope that it never happens)

  6. Avataaar/Circle Created with python_avatars MarkBuildGood says:

    Have you thought about making a build that fits into a standard server rack?

    I think using some off the shelf parts would make everything look clean and more professional.

    Most server UPS’s are lead acid so it would be nice to have something lithium thats custom.
    Using a server rack form factor would make it easy to assemble/customize with different cooling solutions and case options.
    Rugged server cases (waterproof) exist for off grid & emergency response applications.

  7. Avataaar/Circle Created with python_avatars Akhona Ngquba says:

    You need a way to hold the bottom part together. I see the board flexes when you lift it up. A blank (unprinted) circuit board will do. This is super easy. You habe really made building batteries super easy. Brilliant

  8. Avataaar/Circle Created with python_avatars Brian Francis says:

    Do you plan to make the BMS board available on PCBWay like the cMax 48v projects? It would be nice to be able to buy the modules and buy/build the BMS board separately. Especially since the 48v master kit is sold out already.

  9. Avataaar/Circle Created with python_avatars shize9ine says:

    The limiting factor is the bms and pcb traces IMO. 60amps is pretty low for most 48v applications. 5amps per board is too low when 26650 LiFePO4 A123 cells are rated 70amps continuous and 140amps pulse. Would be ideal if each pcb had a 4s BMS and the final top board would have a 200amp BMS with 12v or 5v break outs for fans and other monitors – balancing all the individual PCB’s. Then you wouldn’t have to worry about individual balance or pack to pack balance. I’d buy something like that in a second.

  10. Avataaar/Circle Created with python_avatars Stephen L says:

    Have you thought about opensourcing the original files used to make the PCBs? I see we can order based off of what you have designed, but curious if you have thought about providing the orignal files.

  11. Avataaar/Circle Created with python_avatars Jay- Rus says:

    Would like some input on this. We are preparing for phase II of our solar system plan, and would consider this setup if it makes finance sense.

    Really like your videos and products, but have to admit that it seems the cost of building one of these is as much as an SOK battery. Maybe if someone has specific size requirements for their application?

  12. Avataaar/Circle Created with python_avatars Rud Dog says:

    Have not watched the video yet like to save them for evening viewing. Will take a chance you did not answer this question. Do you have a pack @ 54.6v with an output of 11.4Ah. It would replace a 13s4p pack?

  13. Avataaar/Circle Created with python_avatars Shadow Moon says:

    Very creative, great job. I have several of your 10x 24v packs and they have held up well. Would you please consider the same layout a 4S 12v version for 18650's. Keep up the great work.

  14. Avataaar/Circle Created with python_avatars Edward van Hazendonk says:

    Cool, your modulair thoughtprocess keeps giving us more options. And it's KISS so that makes it very worthwhile. Thanks for sharing and creating.

  15. Avataaar/Circle Created with python_avatars Diane Ohmacht says:

    Lost my boyfriend last year because of these battery pack he made it cause a house fire he could not walk out we was together for 13 yrs also lost 2 cats in fire as well September will be a year since house fire l got them out on porch but they exploding as I was removing from house

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