A lemon battery powers an LED. From the Make: Flickr Pool.
Lemon Battery
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Gareth Branwyn is a freelance writer and the former Editorial Director of Maker Media. He is the author or editor of over a dozen books on technology, DIY, and geek culture. He is currently a contributor to Boing Boing, Wink Books, and Wink Fun. And he has a new best-of writing collection and “lazy man’s memoir,” called Borg Like Me.
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Please stop calling these things fruit-powered.
The fruit is just a sack of acidic fluid that activates a copper-zinc battery. It’d be like calling a lamp kinetic-powered because you have to flip the light switch.
lemons must be dirt cheap elsewhere – here, fresh lemons are $1.59 each (not a pound!)
use paper cups and some white vinegar; save the lemons for tea and cocktails.