Hi, you probably already know about lemon batteries or bio-batteries. These usually use 3-4 lemons to barely light up a led. Good designed ones use just 1 lemon. I'd like to show you mines. They use a few DROPS of lemon juice. The Smallest uses just 1 DROP. The lightest weights half a gram - 0.5g. They light up a 3.5V, 35mA white Led for at least 1 hour. After 1 hours (more or less depending on climate) the lemon juice evaporates. It is like a natural timer. If you want more light, just put another 4 drops of lemon juice. You can re-use it for many, many times before oxidizing makes it unusable. Well, let's see how to do (in less than 10 minutes) the Tiny Lemon battery Design 1 and 4, with materials you have around house and zero cost. After that I'll introduce you to the flower lemon battery design, in which you light up the led by watering the flower (with drops of lemon juice). Finally, we will see other 10 different designs for making a battery out of ordinary materials. A little step toward a greener planet if you use this instead of buying a battery to light a led or as an emergency flashlight ;) If you will like this instructable, please vote it! This instructable is in the Epilog Contest. The winner gets a laser cutter. It would be perfect if I would have something like that at home, I could have made the "Diy Folding Camera instructable" way better and would be of incommensurable help witth my next project, which i'll anticipate you that will involve giving a hand to a friend... literally. Replacing his ugly prosthesis (and immovable, so useless too) with something more smart, using some tech and old tecniques from... ah, i'm already telling you too much ;) have fun!
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step 1Materials
'''Ok, Let's start. We will make now the Tiny Lemon Battery with led, design 1. Very basic materials you will need, you should have more or less all of them around house…
step 2How it works
This battery is a zinc-copper battery. Searching with google or wikipedia will give you exact explanation of the electrochemical reactions involved, but here, we'll just se…
step 3How to make the cells
Cut about 1.5 cm of Iron wire. Take one paper facial tissue and carefully extract one of the 3 or 4 layers that compose the tissue. (The thinner, the better). Cut a a re…
step 4Done!
Solder the 4 cell in series to the led, respecting polarity according to the scheme. Put 1 drop of lemon juice on each cell. And voila', enjoy one hour of free light …
step 5The Flower Lemon battery
This can also be a very original gift. Give it to your special one, bring her and the flower in quite darkness, then give her half a lemon (or lemon juice in a nice tiny c…
step 6The Flower Lemon battery, better design
The flower lemon lamp! Same idea as before, but many improvement. Details: 18 cells, 3 yellow leds, for the flower. 1 green led for the leaf. Tools: scissors, g…
step 7Other designs_1: The Long Lasting
Here we make a battery trying to maximize duration and portability, that is quite solid too. Also good looking and green ;) Materials: Each cell is contained in thes…
step 8Other designs_2: The straw battery
Basically, each cell is made up of a spiral of copper wire, another spiral of zinc-plated iron wire, inside a transparent straw filled with hand dish washing liquid, and se…
step 9Other designs_3: The futuristic lemon battery
Similar design as the previous one. The strange circular plastic item is a connector that you find in the box of light sticks ( 2 of them are included so you can make a sp…
step 10Other designs_4: The RCA lemon battery
Similar to the straw battery, but here instead of the copper we use the gold plated connectors from an unused gold-plated RCA plug. With 5 of them in series we have a qu…
step 11Other designs_5: The almost AA battery
Here is my first attempt at making an AA battery, using only copper and zinc-plated iron wire. Even if it does not meet the specifications of an AA battey, it was quite go…
step 12Other designs_6: The (better) almost AA LB
A better design, still not powerful as an alcaline AA battery, but with a lot of space for improvement. More detail about the making steps is coming...
step 13Other designs_7: The Palugraph lemon battery
The Paper Aluminium Graphite battery One of the simplest battery that you can make with common household items in less than a minute. Extremely light and thin, but wil…
step 14Other designs_8: The CPA lemon battery
A quite simpe design: a stack of copper foil - paper - aluminium foil, with a drop of hand dish washing liquid.
step 15Other designs_9: The ultra-thin Lemon Battery
A nice design for an ultra-thin battery. Try making an armlet connecting 5-6 of them and a led in series ;)
step 16Other designs_10: The rechargeable hydrogen battery
The rechargeable hydrogen battery (or the ultra basic fuel cell) Materials: -Transparent Straw, about 3 com long -Small rods of activated carbon for aquarium -Some wi…
step 17Final considerations
Here you have seen many different designs for making a battery out of ordinary materials. Some designs are at the moment explained better than others, I will update th…
http://www.instructables.com/id/The_micro_Lemon_Battery_reusable_1_hour_of_led_l/