The silver coated beryllium copper will be the easiest to solder to, and you will lose little in the way of conductivity over pure copper. Pure copper is a poor material to make springs from, as it is too soft.Nickel Plated Music Wire and Silver Coated Beryllium Copper
Lee Spring manufactures its unique line of Battery Springs in a choice of nickel coated music wire or silver coated beryllium copper.
Since most alkaline batteries have nickel coated containers, a nickel coated contact is suitable. The use of similar materials removes the possibility of galvanic corrosion and aids in wear resistance. Nickel will also tend to wipe and aid in breaking down the oxide that can form on the battery contact surface. In addition, a nickel coating will provide general corrosion resistance and is a good conductor of electricity.
Beryllium copper is among the hardest, strongest, and most wear-resistant of copper alloys. Silver coating further enhances electrical and thermal conductivity. The electric conductivity is 65 to 70% that of copper, and the strength and fatigue resistance are comparable with higher beryllium alloys. The light silver-plating allows for easy soldering. Beryllium copper is corrosion resistant in various environments, and is both non-magnetic and non-sparking.
I broke out with a big grin when I saw the image - it's painfully obvious that the surface metal is NOT copper! I have to wonder what genius called them "pure copper" springs?
Just remembered seeing them, wouldn't think a pure copper spring would be too 'springy', and would tend to break easy. Personally, I'd scrounge something up around the house. Spring out of a retractable pen, probably. Depends on how many the OP is looking for, just figured this would be a potential source, if several are needed. I'm sort of looking for a springy solution for using cellphone/camera lithium batteries in other projects. Copper would be a poor choice, gold plated ideal. Sort of worked out an idea using pin headers, but didn't really line up well with the battery terminals, little longer would have been nice too. Did notice that the plastic spacer moves when heated, so might try again sometime.I broke out with a big grin when I saw the image - it's painfully obvious that the surface metal is NOT copper! I have to wonder what genius called them "pure copper" springs?
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by Steve Arar
by Jake Hertz