Pure natural design: lemon battery flashlight

I made a flashlight using lemon as an electrolyte. The production process is quite detailed, so I recommend it to everyone.

The electrode materials used were copper and zinc (galvanized iron nails), and by connecting several groups of primary batteries in series, an LED was successfully lit up.

The schematic diagram of the entire device is as follows:

The production process is very simple and can be done with a pair of pliers.

This is a purely scientific experiment to learn the basic principle of primary batteries. You should know that lemons in the supermarket cost 3 yuan each, which is much more expensive than ordinary dry batteries.