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Power loss was marginally higher with the thinnest strips(0.1mm vs 0.15 and 0.20mm) but since a low weld energy was needed to be safer and allow lots of welds to be done, the 0.1mm nickel was chosen
Weld projections(basically hole-like impressions) were added to the nickel strips – helps spot welding to be more effective)
Longer slits were added to force the current through the cell instead of just the copper??