Oil paper, aluminum foil paper or kraft paper can be used instead. The original tin foil is really made of tin, which is softer than aluminum foil and has a little tin smell when wrapping food. At the same time, tin foil has a low melting point and cannot be heated. Now most of the tin foil is aluminum foil. If the battery is small, you can use oil paper, aluminum foil or kraft paper instead. Battery refers to a part of the space of a cup, can or other container or composite container containing electrolyte solution and metal electrodes that generate current, and a device that can convert chemical energy into electrical energy.