Battery springs are important functional components that establish electrical connections between dry cells or rechargeable batteries and equipment, and maintain stable current flow. They require conductivity, appropriate spring properties, and corrosion resistance, and are primarily made from high-conductivity, high-strength materials such as phosphor bronze, stainless steel, and beryllium copper. Common processing methods include contact springs made by pressing from sheet material, and coil springs processed from wire material. Surface treatments such as nickel or gold plating may also be applied to reduce contact resistance and improve durability. They are widely used in all battery-powered products, including remote controls, toys, medical devices, and various electronic devices.