Fruit battery operated watch

Fruit batteries seem to be made by experiments in science in junior high school, but there is a digital watch that moves with it.

Details are as follows. Just by cutting a lemon into half and inserting a copper plate and a zinc plate, the electronic music box sounds, it is contents you learn in science class, but the digital clock using that battery is here.

Fruit Powered Clock

The name is "Fruit Powered Clock" as it is. It is sold for $ 14.95 (about 1750 yen), but it seems that fruits are not included so you need to prepare yourself. How much does this watch, lemon have with one ...

·bonus

How to make fruit batteries is here.

Fruit Battery

Students who are making fruit batteries and tension rising.

YouTube - Experimenting with Fruit

There is also a charcoal aluminum battery (Bincho charcoal battery).

How to make charcoal aluminum battery

Bincho charcoal battery failure