After the failure of my $16 battery tab spot welder, I saw Kevin Dark’s DIY version.
But it wasn’t exactly what I needed, so I decided to build a modified version.
The Modified Dark Welder, or Dark Welder 2.0, has a foot switch that triggers a precise welding current pulse that is always the same length of time – no matter how long you hold down the button.
And in my new version, the button is now a foot pedal to keep your hands free.
The best part is: IT WORKS!
I’ve been looking for a cheap battery tab spot welder for 18650 lithium-ion cells for awhile now.
The usual ones just aren’t worth the cost. For example, for half the cost of a welder, I could buy at least 2 brand new power tool battery packs.
Enter the $16.99 Portable Mini Spot Welder!
At that price, it was worth a shot…
Ever wonder about the differences between alkaline, nickel metal hydride, and lithium-ion batteries? Wonder no more!
Alkaline batteries are great for their initial higher voltage, but the total current available drops off (along with the voltage) over time.
NiMH cells have a lower voltage, but it stays constant along with the available current.
And finally, lithium-ion batteries are in a class of their own: You can even get high C-rating Li-ion cells where you can safely pull even more current than the cell is rated at, and the voltage only drops a relatively small amount.
Watch the video for more details!
You’ve got a cordless power tool or two. And that means you’ve got some over-priced Li-ion battery packs to run them.
What about cheaper aftermarket packs?
Are they good? Are they crap? Are they worth it?
Find out in this action-packed video…
If you’ve got any kind of gizmo – laptop, tablet, e-book reader, cell phone, MP3 player, cordless screwdriver or drill, etc. – then you’re using lithium-ion batteries all the time.
Lithium-ion batteries, often abbreviated as Li-ion, are extremely common these days.
But what about so-called Lithium Polymer batteries, also called LiPo or Li-poly batteries? Are they really better?
If you believe the marketing folks, yes they are. But, as it turns out, you’ve been fooled just like me!