Dark Welder 2: My DIY battery tab spot welder

Dark Welder 2: My battery tab spot welder!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!

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Batteries: Alkaline vs NiMH vs Lithium-ion

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!

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Lithium Polymer vs Lithium-Ion batteries: What’s the deal?

LiPo = Li-ionIf 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!

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