FNIRSI SWM-10 Spot Welder Teardown Disassembly 4K

This is a FNIRSI SWM-10 battery spot welder, used to spot weld nickel strips to lithium batteries i.e. 18650 and 21700 cells for repairing, rebuilding, or building battery packs.
I haven't seen a teardown of this device yet so I thought I'd make one. I have not had a chance to use the device in depth yet so this is not a review, it is just a teardown for you to see what is inside the device. Overall, my impressions of it are pretty good and I think it's a decent device.
Warning: The background music used in this video was generated using AI. The voice and video are human.
00:00 Introduction
02:13 UI and Settings Menu
07:05 Pass Through Charging
07:57 Teardown and Disassembly

[@WaschyNumber1]

The delivery strips in the box are nickel plated steel and its 10mm width x 1.03mm thick.

[@Ohm7111]

Thanks for this amazing teardown! There is some charging bug on my unit. If I discharge the battery and charge it, it will charge to 4.2V with regular CC/CV. But if reconnect charging cable or start charging from not empty, the battery is charged to 4.4V. Weird.

[@liminalsunset]

I've never discharged mine but it appears to charge to 4.4V. I assume the battery is a high voltage chemistry perhaps. It does seem to work better when charged to full.

[@andresrosin1838]

You can update firmware through usb c, eliminates often problems with short circuit protection alert...

[@liminalsunset]

Yes - Make sure to wait a long time, when the LED flashing color changes when doing this, as doing so before will lead to the device not booting. It is fully recoverable however it appears

[@WaschyNumber1]

How does the firmware upgrade work 🤗 Does it work with android or PC and how, please? 🤔

[@liminalsunset]

@@WaschyNumber1 I'm not sure about Android but I believe you have to hold down the power button for a few seconds while plugging the device into the computer, then it shows up as a USB drive that you copy the firmware into. You then have to wait a few minutes until the flashing light changes color before trying to turn it off/on again.

[@WaschyNumber1]

@@liminalsunset thanks very much, wher do I get the firmware please and I hope its the official frome the manufacturer. 🤔

[@liminalsunset]

@@WaschyNumber1 Yes you can go to their website and go to the Downloads section where it will be in the welding tools section.

[@rudigunawans749]

can weld 0.2mm - 0.25mm thickness nickel plate to battery. such as product description advertisements ?

[@ariesleo7396]

If you play with settings the max is 0.2 pure nickel. Highest I recommend is 0.15 pure nickel.

[@liminalsunset]

It already struggles with welding 0.15mm nickel plated steel to 18650 batteries. In order to get a good weld you have to press lightly and not too hard, and keep the probes close to each other. This was the difference between it never working and working well enough.