0.05-1.2mm Pure Nickel Strip Nickel Foil Tape For Lithium Battery Packs If you want to increase the current, you can increase the number of series connection, or add a layer of pure nickel in parallel connection Regarding the detection of pure nickel belts, (1) use a sander to grind without sparks, (2) put it in salt water to test, and it will not rust. --For connection of 21700 lithium battery pack--Thickness 0., 2mm,Wide 10mm,lenght 5 Meters--After testing, the 0., 2mm thick and 10mm wide pure nickel belt can continue to pass a current of 25A for a long time (the test time is 60 minutes). 99.96% Pure Nickel 5m Pure Ni Plate Nickel Strip Tape For Li 18650 Battery Spot Welding Pure Nickel Strip The magnetic properties can be confusing (pure nickel is actually magnetic), so don't rely on the magnet test alone. For spot welding 21700 lithium batteries (or 18650s), this material works beautifully because it avoids the rust and corrosion issues you get with other metals Note that pure nickel belts are magnetic metals and cannot be simply tested with magnets --Pure nickel strip tape,high purity to 99., 96%, 100% new and high quality. Nickel Strip 0.15mm X 10mm 1P Plane Coated Nickel Welding Strip For 18650 Lithium Battery Pack E-bike or e-car battery packs or other mobile battery pack requires the pure nickel strip to spot welding to avoid rust and corrosion,More Safe and efficient