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Making Your Own Batteries

This photo involves a pretty precarious-looking setup. Someone used some aluminum foil to fit in a couple of undersized batteries. Not only that, but they stuck a spring where the third battery should go. We know how frustrating it can be to not have the right type of batteries on hand, but this thing looks a couple of seconds away from either exploding or melting down entirely. However, it does work.

Also, what is that spring doing there? How is it working if it's just touching both terminals? We hope they didn't let their kid play with this thing after they finished.