I like this build, the author has a 3D printed out holder too. This would be a cool build for kids.
http://www.instructables.com/id/Building-and-Testing-a-Penny-Battery/
I like this build, the author has a 3D printed out holder too. This would be a cool build for kids.
http://www.instructables.com/id/Building-and-Testing-a-Penny-Battery/