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Minimum voltage required depends on how you set the potentiometer for the DC-DC converter, 300w is very little ZVS driver wise, i'd try to use the one i linked in the description if possible.

There's another video on my channel where I explain that :) it's basically a small step down converter inside the case, and a makita battery holder on the outside.

Yes, it's just for charging the internals :)

@@diybatterytech That's genius! Have you tried welding copper/nickel strips with the 801H? Does it have enough power to do such a task?

I've used this for 2-3 years now exclusively with LXT batteries.

Thanks for your nice comment, i will try to find some time to post more :)

I built this for around 150 euros, but most of the cost was in the case and glass, could probably be built cheaper with a wooden box for instance.

Hi, i'm not an official channel for this company, just a guy doing DIY, maybe try the official support?

if you have no parts i would do 180w with fan, and put the fan to the side of the case, but if you have an old heat sink laying around that you can attach you can do 30w version and use your own heatsink - as shown in video :)

500R 0.5w, standard resistors is what I used. The aliexpress link does have 560R resistors, so i don't know what you are talking about - i used 500 ohm. PCB from aliexpress can have a slightly different arrangement but principle is the same, solder resistors instead of batteries, and + and - to the actual battery.

Also just to clarify - the circuit is a just resistive divider, it will work with any sort of resistor as long as you use all the same ones, between 200 and 1k ohm.

Hey thanks for the update, and i think the one with the small fan will fit, it's better to fit the fan to the side air inlets though - as it needs some air to move - but you can just extend the wires. Thanks for your comment :)

It's a capacitor, unlike a battery it will not die.

this capacitor you can change

801H works fine for me, have used it for over a year now. But it depends on what you are trying to do, what kind of packs are you going to make? What current capacity, amount of cells etc?

Körülbelül 80-100 db cellát szeretnék alkalmanként hegeszteni illetve még egy konkrét kérdésem ez megtudja hegeszteni a réz szalagot?@@diybatterytech

@@istvanszilagyi5773 This one cannot weld copper tape well - it will weld zinc coated copper, you would need a different welder if you want to weld pure copper. same brand also has bigger welders for copper tape.

@@diybatterytech A nagyobb kapacitású gépek is szuper-kondenzátort használnak?

@@istvanszilagyi5773 Yes, if they are the same brand they do. There are also others that use supercapacitors.

The battery has a BMS that does charge cut-off. The part of the charger PCB that I kept also does charge cut-off. Both are safety to make sure the battery does not go poof :P

To add to that, the switching converter is set to 21.6v, and about 80w. including the voltage drop of that charger part of the PCB you get 20.4v output max - within the 21v max that the Makita battery can take. So you have multiple layers of safety to make sure nothing blows up.

If you set the spot welder to too high a power level, yup. But if you stay around 40% ish for 18650 cells you'll be fine.

Hi, yes just set it to 15v. you can also use a usb-c PD decoy board with 15v output if you want usb-C.

Use a heat gun carefully ( don't overheat the plastic ) or place the plastic bottom part on a radiator. Then use a screwdriver to pry loose the metal from the plastic.

www.infineon.com/dgdl/IPLU300N04S4-R8-Data-Sheet-10-Infineon.pdf?fileId=5546d4614755559a01476cd7a7417b72 this type mosfet, 5pcs in paralel. will upload a picture in a bit.

coredump.ws/images/chips.jpg image of the chips on the board

​@diybatterytech good video dude, would you be able to say the thickess it could weld please, ive seen videos of these used on stainless steel rod any chance you know whether it can actually weld that or not? Cheers

I modified it to be remote, so no wire ;)

You're welcome :)

That's what I'm using in the video, at 40% power it can weld it fine.

th-cam.com/video/u-Ln39pwxr0/w-d-xo.html Made a video answering these questions. I welded 0.3mm ( 2x0.15mm ) with it.

​​​@@somedude9386how hard do you press the welding pens? The welding pens have springs, do you press them up to the point when it starts compressing the pens springs or you use lighter pressure? I found with lighter pressure it has better adhesion but the weld spot is smaller and it can also burn hole if the pressure is lighter.

You should invest in a power srew driver 😂

Will go check this weekend, but from the outside it looks like a Chinese boostcap ultra capacitor

@@somedude9386 by the way, nice update of your welder. Want to buy same, I’m using simply transformator welder

@@kor_nellione Thanks, I live in a really small place so not having wires was kind of a necessity :) There's a heavy metal block that is in the base that you can remove to put electronics in there.

@@diybatterytech interesting, would this 801h weld nickel plated cooper 0.3 thickness, like in dewalt batteries

@@kor_nellione currently out of my appartment, but will check this evening. the specs say it should be able to, and from what i've seen it can so easily weld 0.2 that it should be able to.