Surplus electronic parts : https://epartsconnect.com
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Complete Kit: https://jag35.com/products/x25-pcb-7s-18650-tool-box-kit
You will need to order these additional items to finish the project:
1x - Makita Box Large - https://amzn.to/3Ajar73
1x - 24v 5A Charger - https://s.click.aliexpress.com/e/_AcKBEj
x175 - 18650 Li-ion Battery Cells - Harvsted from modems https://jag35.com/collections/lithium-batteries/products/new-sealed-modem-18650-two-cell-battery-pack
New Tesla18650 cells : https://jag35.com/collections/lithium-batteries/products/tesla-model-s-cells-like-new-18650-panasonic-ncr1865j2-3400mah

Today, i'm going to show you how to build the tool power box out of a kit, let's get into it all right. So, let's start our project. Here are the things that you are going to need. First you're gon na need your pcb kit that you got a jack 35 right then you're gon na need the makita box.

This one has to be the large toolbox right because there are several other sizes, then the other important thing is gon na. Be your battery cells, and here is the thing that you're gon na have to make a choice. The easiest way to build this project is to use brand new battery cells 18650s right. Any brand doesn't really matter.

It's not that important. The only thing that you have to do is they have to be 18 650s, but of course, brand new cells are kind of expensive, so the best and the cheapest most affordable way is to actually harvest your cells out of modem packs. These are modem packs and i have a ton of videos showing you how to extract the cells from these right. So what you end up, is you crack these open and then what you do is you this is what's inside and these are good quality cells.

These are samsung. 18. 650. 26Fs right.

So these are 2600 milliamp hours. Then what you do is you take off all the stuff and clean them up, and you end up with clean cells that then what you can do is you can load up into your 25 uh pcb boards right, and i suggest that you test these right. So you put them in a charger and you cycle them through a couple cycles, and then you you, you know you can write in there. You know the capacity and internal resistance and then you match them right.

So you put some that are not super degraded together with some that are really good, so they're as closely matched as you can and then once you have that, then you load up your uh board here right you just uh. You pay attention positive to positive negative to negative, and this is one of the easiest ways to build a battery, because that's it we're done. We built ie battery right. It's done.

All you have to do is just put more batteries because you want it bigger than this. So another thing that i did is you use. This heat shrink wrap that we do that we put in here just to protect it. You don't have to do it, but we i did it, and so it looks like this when they're done and all you need is a heat gun and uh, you put it in there, apply it and then it shrinks there and it protects the batteries right.

So all our boards are gon na. Have that - and i already did that here and here are batteries ready to go battery modules all right. So first step i say you do the dirty work first and then we get that out of the way and then we do the the other stuff right. So the dirtiest part of this work is cutting the face right, the uh board into this box here and what you have to do is you need a marker and then you what you do.

Is you flip this pcb backwards right and then usually you can like? My marker doesn't go all the way through, so what you can do is just eyeball it, and all you have to do is mark where that screw is going to be at because you have to stay away from that area and not cut it. You basically need meat there to be able to have something that the screw can attach itself to so there's one there and then the other one is right here right. So there we go so what we can do is we can cut like that, like that and then pay attention to not cut there, that corner this corner and then over here not cut that corner so for the next part of this you're gon na need some Power tools well yeah. I guess you could do it without power tools, but these are gon na help.

You a lot. You can just use a saw, or maybe a knife right. It's just gon na. Take you a long time to cut, but it's possible.

You can do it, but the easy way to do it is to use power tools. This one is just a drill bit. It doesn't really matter what size of drill bit you're going to use. It's just to make holes to get the bit started right.

So now we try the face see if it fits. We just have to uh remove some stuff in there clean it up clean it up. There we go now. Let me get the screws.

Okay, the other messy part of this is going to be this connector. This connector has to come out so now i've taken it off and the place where this goes. The best place is right here in the back right side of the box right, here's the front. This is how you open it.

So this is the back and right in the middle here midway. You make a thing there. That's where it goes. You're gon na have to install this in there, because once you put the batteries in there, you won't be able to do it.

You know it's fine. So after you assemble your five stacks of five boards, what you're gon na do is you're gon na try to assemble this whole thing outside and then try to put it in there right. Here's the first stack and it's got the connector towards the bottom. So this is how you do it.

You do it like this and maybe to help you, you need to put that on the side, make sure the connector is there. Okay, one thing that is very very important is that you need to make sure that all these stacks they're the same voltage. If you have one that's like drastically different than the other one, then that's going to complicate things because you might see sparks you might see a lot of energy being transferred while you're building this, and you don't want that right. You just want them to go together without sparks are scary, so next we're gon na do the back one here and the same thing with the connector towards the front.

The next one is the same thing with the connector to that side. Next, one same way slide the connector in there, okay and last this one on this side. This thing right here uh is optional, but it's very very useful is the batco bg-8s right. This will allow you to check the individual cells and all of these modules right.

So, first, what we need to do is connect these cables, this one there we go so now. You can connect this, because this is now connected in there and here's the thing. If it doesn't work, if nothing happens then all i have to do is flip it over bam. There we go so our battery is alive and you can see the voltage of each individual group now in there right.

So total is 26.14 volts, but each group, each of the seven groups, has about 3.7 volts and they're all pretty. Even you can see that there's a variance of 4 millivolts, so these are almost perfectly balanced in here. So the last step is to put it in here: try it and slide this in there sideways almost there there we go, and now what we can do is connect this cable to our face that one connects there and, let's see if we have anything on the Front, it's got the usb sockets in here right and this connects and disconnects that, so it doesn't waste your battery. Then this has your meter and in the back.

Well, that's the power connector and you can connect anything - that's 24 volts in there. So the last thing to do just to secure it with some screws on the front and in the back and there it is, that is your battery. So what can you use this battery for well 24, volts right, anything that runs on 24, so some rvs run on 24. A lot of equipment runs in 24, there are 24 volt inverters and here's the cool thing about this is that there are different boxes sizes and you could also build this box or even a bigger one like that, one, that's behind you there right and you can Just stack them and they attach to each other right, and so this way you can build a bunch of little batteries that attach to each other and through the back, then you can just interconnect them together right, and so you can build a huge battery with a Bunch of little ones so that you don't have to carry one giant battery right and also uh.

What i'm gon na do with this smaller size is also add the inverter. So i'm designing the inverter already in here and then put the connectors on the side here and you'll, be able to just connect this one in here and then have ac plugs that you can connect and power tools and power. Whatever that you want us uh, as well as all kinds of other usb and low power, low voltage, uh connectors right, like 12 volts and also stuff, so there you go, and that is how you build your tool: power box. Okay, as always, this kit is available at jack35.com links are in the description.

I want to thank you for watching this video we'll see you on the next one. Bye, no.

13 thoughts on “Stackable Tool Box Battery Build Project”
  1. Avataaar/Circle Created with python_avatars Radek K. says:

    Makita systainer lock system is terrible, no one want open it frequently. This is nice kind of use for it. 🙂

  2. Avataaar/Circle Created with python_avatars Drazen Bibeskovic says:

    How about cooling, how they hold with heat in constant usage or with charging? Heat can't escape that box

  3. Avataaar/Circle Created with python_avatars Nick says:

    My right ear is sad, how come you can't even pan your audio correctly when you talk too much?

  4. Avataaar/Circle Created with python_avatars Ivar Bredesen says:

    Nice stuff, my only complaint is I wish the camera person would stand still and not wobble so much 🙂

  5. Avataaar/Circle Created with python_avatars Terry Nadosy says:

    Well that's fantastic, but you failed to mention how you charge the unit after in use? This is a cool unit and I can see its use in my service truck at a 14-18 volt compacity.

  6. Avataaar/Circle Created with python_avatars terry holman says:

    Could not stand to listen to the audio track. The music is so annoying. Project looked interesting, but not enough to sit through that.

  7. Avataaar/Circle Created with python_avatars Rob The Squire says:

    Not bad..gives me a few ideas but I would put a plate on the bottom of the batteries to secure them. Like you have for the charging board so they don't move around during assembly and transport. Then I would move the display and usb ports on the front rather than the top so you can use them while cases are stacked on top.

  8. Avataaar/Circle Created with python_avatars Dave Graham says:

    would love to see something like this for greenhouses (so, environmentally sealed) or such where I can charge them via solar. is that going to be part of something you'll do in the future?

  9. Avataaar/Circle Created with python_avatars Justin Gulley says:

    This is worthless everybody's looking for A 110 converter. Lol cuz makita don't make one

  10. Avataaar/Circle Created with python_avatars Michael Borowski says:

    My man, this is NICE! Do you have a mailing list for when the kit is back in stock? I have to have this one, and how difficult would it be to change it to 48v? 24v is fine though, I can work with that. Nice work I love how neat and clean that goes together, fits perfectly! And I love how easy it is to change the batteries out, so this will last forever as long as you replace the batteries when needed. I might need two kits, one for my dad on fathers day..

  11. Avataaar/Circle Created with python_avatars Electro jessy says:

    If you parralel the batterys 2 boxes they need to be around the same voltage just like the cellpacks

  12. Avataaar/Circle Created with python_avatars Peter Coutu says:

    You should definitely develop this into a more branded kit, maybe consider contacting a toolbox/ plastic case manufacturer. That way the cutouts will be more precise.

  13. Avataaar/Circle Created with python_avatars tonchido says:

    I hate thid makita boxes,they are terrible.dont buy,useless,you will brake your fingers before you will close them

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