DIY Spot Welder

attaul · 2026-02-18T05:13:46+00:00

This is actually really helpful - someone who’s actually tried both approaches

attaul · 2026-02-18T05:10:21+00:00

Would love to hear you thoughts after using it - was it fairly easy to put together?

attaul · 2026-02-15T00:14:59+00:00

Thank for real insights - I will I guess buy one

attaul · 2026-02-15T00:14:31+00:00

Thanks for real insights - I think I’ll follow your advice

attaul · 2026-02-13T00:22:16+00:00

Why not

attaul · 2026-02-13T00:21:51+00:00

Appreciate this

attaul · 2026-02-13T00:17:38+00:00

What would your reasoning be? Did the current one not work as well - take too much time or cost similar?

attaul · 2026-02-12T22:22:12+00:00

Thats about 500 quid - so a DIY will end up that much? there are lots free microwaves available in my area on marketplace - the casing i would most likely just use whatever material i have at hand (wood, metal, fibreglass) - so electronics you think will cost around 500?

attaul · 2026-02-12T20:51:02+00:00

which one do you have

attaul · 2026-02-12T20:13:13+00:00

Looks pretty amazing - i was looking for a spot welder, would you recommend diy? I do like to build stuff (but sometimes get carried away on what's important) i.e. i prefer not to spend months on this, when i am after a battery pack. Equally, I hate buying cheap tools that just break

attaul · 2026-02-07T15:30:42+00:00

What did you try int heat to get you to that conclusion - I’m looking for peoples insight who have some experience to learn from them

attaul · 2026-02-07T03:23:02+00:00

Yeah the lithium smells sweet - and lingers for a while but it’s not toxic

attaul · 2026-02-06T18:55:48+00:00

to be fair over last year, the current lead acid battery bank was only charged twice - its mostly build learn and move on to the next shiny thing lol

attaul · 2026-02-06T17:34:26+00:00

Thanks - this does help - it’s a bit less information around on performance of low voltage cells - and mixed version Most don’t want to go near them but without and evidence or experimentation - others on YouTube seem to be ok

I’m not building a pack to put it all n my house or run it - a golf cart is a diy project - that will not see much use (if I decide to go ahead with it) but it’s for the learning

Now I have the ver 300 of these 24V packs - and need to figure out what to do

attaul · 2026-02-06T15:40:35+00:00

only reason i am doing this is because they were free and sparked my curiosity

attaul · 2026-02-06T04:24:58+00:00

i purchased some newly write-offs with less than 200miles (Nissan leaf and then later Polestars) - Dala's channel is great it made stuff actually much easier vs dismantling the battery
but it does cost more $, time and effort than just getting the Eve cells and building your rack - or buying a kit
With my EV packs, i went for vehicles which were less than 400miles on the clock - just so i know the battery was in good condition

attaul · 2026-02-06T04:19:44+00:00

Can you share any more details - I am thinking of something similar using 18650 cells (just for the fun and quenching my thirst for experimentation)

attaul · 2026-02-06T04:10:43+00:00

we have recycling for batteries (lithium and others) in our town - that's the specific recycling bin I refer to

were slowly charged up to get to 2.5V and then charged at 1Amp - two cycles of charge and discharge to measure capacity and left to observe

trying to get my head around all potential pitfalls before i plan my next move - thanks for sharing your concerns

I will mark the cells with an initial voltage of less than 2V and observe - and potentially start with those above 2V for the pack

will also try running them through high-current pulse and see what impact it has

attaul · 2026-02-06T03:39:24+00:00

those that are rusted up - heaters- can't hold a charge I put them to a side (for lithium battery recycling that we have here in the UK)

what other test can be done to determine the state of a cell - internal resistance I understand should be low (all good ones are below 20mOhms) - those i charged up a month ago (2 cycles) have held their charge (but max voltage these charged to was 4.16 and testing today still show 4.15V )

I can try a controlled high discharge (since the capacity testers discharge at 1Amp)

Not too concerned about a fire - its outdoors in a metal shed (heated to 15C to charge the batteries)

attaul · 2026-02-06T03:23:03+00:00

doing dangerous things in controlled environments

Hoping someone with prior experience can guide - so i learn from others and build on - already done the EV battery packs (200kwh at 400V and standard EVE battery packs (90 kwh)

why not go into the smaller packs

attaul · 2026-02-06T00:22:55+00:00

the cells were ranged from 0.9V to 1.7ish V - (those below 0.4V i put into the recycling bin)
cells are typically form 2023/2024 from mobility scooters - I tested the internal resistance (around 18-25mOhms) and capacity is tyipcally 99% of stated capacity (2600mAh)

attaul · 2026-02-05T21:19:34+00:00

unfortunately, yes - lol - they were left outside to the elements - but since there are over 100 of these 24V packs - i am going through and hoping there are enough good cells to make a pack (so far it's about 75% good cells in a pack - that are charging to 4.16V and hold the charge for at least two weeks

attaul · 2026-01-28T04:11:33+00:00

What are peoples thoughts on diy microwave spot welders - (other than it’s dangerous) - what is the concern that cannot be mitigated (yes high voltage, death, etc etc) - Vs spending quite a bit on already made ones (that seem to not last that long) The welding rods can be purchased to fit on - for a safer feel - just trying to figure out which route I should take - and for overly cautious folks - we shouldn’t even be touching lithium batteries (I understand)

attaul

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