Instructables
Picture of Emergency Battery in the Wilderness
Imagine this situation:
You're camping in the wilderness. In the area where you have your tent, there live carnivorous man-eating scorpions which are active at night because they are afraid of light. So in the evening you are testing if your flashlight is still working, because you need it to scare off the scorpions. You see that the battery is empty.
Is this a reason to panic?
NO!
Because you have read this instructable!
You don't have a working battery anymore, but you probably do have: some coins containing copper, aluminum(from a can or a lightweight cooking set), sour body liquids(urine, or even better, puke), something that can absorb(like toilet paper but just some earth will also work), some leaves from a tree(the bigger the better), and some tape or rope.
In the last step I will tell how you can use the battery in the wild, first I'll demonstrate how to make the battery with kitchen products. Try that at home as a practice! You'll need it in the wilderness, it works the same there. For example, we'll use vinegar or lemon juice, instead of urine or puke, but it will all work(So if you find a lemon tree in the wilderness I recommend to make use of that instead of your body liquids, so your battery won't be so disgusting.)
Let's go on to the next step!
 
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Step 1: What You Need

Picture of What You Need
For this experiment, we need:
- vinegar OR lemon juice
- tape
- aluminum foil
- strong paper
- paper towel
- a bowl
- coins(you won't lose them!) containing copper, or copper-plated(these often look red-brown, and are mostly the coins with the smallest values, like 1,2 and 5 eurocent coins. I believe the USA one penny coin is copper plated, and maybe the 5- and 10 cent coins aswell. You can look it up)

you also need something to test the battery, like a bycicle light, or a multimeter.
Advar1 year ago
Useful and lever! But long with copper-isn coins bring a dollar bill or one pound note or what-have-you
Great 'ble, thanks :)
Advar Advar1 year ago
"Clever copper-ish"
lwallace51 year ago
Nice!!!
ordnave1 year ago
Congratulations, I met your site today and I'm loving it, is with God and even more ... (forgot to say I live in Brazil)
ebanken1 year ago
Because I speak Dutch myself, I'm from Belgium :)
ebanken1 year ago
This is amazing!! Just a stupid question: do you speak Dutch? Since vinegar was written as "azijn" on the bottle :)
merijnvw (author)  ebanken1 year ago
I do speak dutch, this is the language we speak in my country :] azijn is dutch indeed. How did you know
the hard bit will be ensuring that the battery you produced creates the correct potential difference(voltage) and current.
Johenix1 year ago
Pre 1983 U.S. pennies (except for 1942 zinc on steel pennies and the 1943-1945 shell casing scrap pennies) are 95% copper 5% zinc, after that it is copper over a zinc core.
This is creative thinking. Have you actually tested this on a lightbulb? Based on my experiences, I'm afraid it wouldn't light an incandescent bulb. The voltage is good, but I think you'll find the amperage is grossly insufficient unless you try it on a very low power LED. http://youtu.be/rIdPfDHeROI
mdaniel51 year ago
Only pennies are copper in the us, but 1980+ pennies have both the metals needed to make a battery. Zinc and copper
Using pennies from before about 1970 work a lot better because they are 95% copper instead of just a thin coating of copper, also I used dish soap and got about 3v from only 7 pennies. Of course after an hour the voltage dropped down to around 1v but it was enough to power an led for a long time.
Shiftlock4 years ago
I don't think urine would be acidic enough for this to work, nor would vomit after a meal, but if you could vomit on an empty stomach and produce some gastric acid, that would surely work, since it's primarily hydrochloric acid. That would work even better than the vinegar or lemon juice.
sharp88744 years ago
 so you want to carry alot of old penny's while camping
VLOEIBEER5 years ago
I tested it, it worked!
It may be useful to know that pre-1982 pennys are a mixture of 95% copper and 5% zinc, while post-1982 pennys have a 97.5% zinc core with a 2.5% copper plating. That may not make a difference, but it's a fun fact regardless.