Help: the area around the weld turns black, with a ring of burn marks too. Is the gear too high, or was the nickel strip not pressed flat? 0.15 nickel-plated on the H1, I'm using gear 45. It tears off when I give it a pull, so I don't feel good about putting it in a pack. Could any old hands point me in the right direction? Thanks!

How should I set it for 0.2 copper stacked with 0.12 nickel? My UF20B is at gear 80 and it still won't hold — not a single mark on the copper side. Do I need to add flux first?

The next Parameters table will be prioritized by vote count. After voting, tell us in the comments which combo you'd most like to see (material × thickness).

Maybe a dumb question: when welding nickel strip on the negative side of a cell, do you need to go two gears higher than on the positive side? I see the pros setting it that way in videos, but nobody says why.

7.4V battery for a small fan, two 18650s in series, but after welding it only reads 3.7V. Did I put the nickel strip in the wrong place? I'll add pics tomorrow, just asking first whether this is a common mistake... feeling a bit down.

(Prototype sample, data not real)

This hand-built Li-ion one is decent, which platform did you buy it on

Why does it jam?

Report comment. Tear it down and show us

So how do you check the battery percentage?

Can I get you to make me a custom one?

Does vertical vs horizontal layout affect current-carrying capacity