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The conductivity of a current through nickel is much greater than that of steel. This is what makes the U.S. Solid roll of Pure Nickel Strip, which consists of 99.6% Nickel, ideal for spot welding and building battery packs. Lithium-ion cells are made in various sizes, often assembled into packs (commonly referred to as battery packs) for portable equipment. Many battery packs also include an internal protection circuit to prevent over-discharge and short-circuit damage. This can increase their physical length of the Lithium-ion battery pack. For example, an 18650 is around 65 mm (2.6 in) in length, but can be up to 68 mm (2.7 in) long if an internal protection circuit is added. To recharge these cells in a safe and economic fashion, the use of a charger specified for these cells is required. Some popular applications include but are not limited to, laptop battery packs, electronic cigarettes, electric vehicles, and cordless power tools. This package of U.S. Solid 1kg (2.2lbs) Roll of Pure Nickel Strip is perfect for building battery packs. Attention: This is 0.15 mm pure nickel, if you process it with a battery spot welder and the spots are not reliable, please weld it with a higher power.