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Sure. Just make them 69/1.68 = 41 times as high cross section!A quick look on the internet reveals stainless steel has a higher electrical resistance.
Cooper for example has a resistivity of 1.68×10−8
Aluminium 2.65×10−8
carbon steel 1.43×10−7 (note the minus 7 not minus 8)
stainless steel 6.90×10−7 (note the minus 7 not minus 8)
So i can easily imagine copper is the most desirable choice. That said is Stainless steel still a problem? should i just make them slightly larger to compensate?
41 x 75 = 3080 mm², say 100 mm x 31 mm. Or to retain the original width, a thickness of 3080 / 25 = 123 mm. You'd need really, really long bolts, and drilling 123 mm stainless steel would be a bitch.Original was 25mmx3mm (75mm2) how much larger would be desirable? 25mmx4mm (100mm2)?
Now you can see why people don't make battery straps out of stainless steel.
I've never even heard of aluminium straps; always copper. Aluminium is brittle.