Learn how to make a working battery with salt water and how you can use it for a science experiment! A kit with the parts for this project is available here: https://www.homesciencetools.com/product/potato-battery-science-kit/?aff=SB1. Complete written instructions, including more background information about the battery's chemistry, are available on the Science Buddies website: https://www.sciencebuddies.org/science-fair-projects/project-ideas/Chem_p107/chemistry/make-a-battery-with-metal-air-and-saltwater.