Nickel strip to connect rechargeable batteries by spot welding. Widely used in all cordless tools with rechargeable batteries that may fail should one or 2 cells deplete voltage below useful life. Sizes available 4mm W x 100mm length x 0.1mm thick and 6mm width x 100mm length x 0.15 mm thick. With sanding, soldering liquid and a higher wattage soldering iron one might even flux solder the nickel strip.
Craft use in jewellery bezel, knife handle lamination insert. Tarnish and rust free.