4 months ago
via answers.hackaday.com
i need a 12v battery the size of a watch battery or similar. if it doesn't exist, can one be made somewhere?
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M$1 Answer
The A23 cell is as big around as a AAA and about half as long, and is about as small as it gets for manufactured 12V battery's. You can get two for ~$4 from most places that sell battery's. Any thing else would have to be custom built.
Building chemical cells is not something that's easy to do beyond that of the school kids potato/lemon cell. If all you want is a meter to read 12v, you can layer foils of two dissimilar metals,(say aluminum and copper) then tissue paper soaked in some form of electrolyte, and keep doing this until you reach your target voltage. This will technically be a battery. But It's not going have any lasting life, or be able to source any current. Not usable for an actual electronic device. You would be lucky to light a surface mount LED with it.
Real modern dry cell battery's use a paste of electrode material. This gives them more surface area and more material to chemically convert. Making and then containing this past takes much knowledge of inorganic chemistry and manufacturing. It took some thing like 100~200 years to go from Galvani's discovery of "animal electricity" to the first thing even coming close to a real useful battery. Not really encouraging for making your own.
Building chemical cells is not something that's easy to do beyond that of the school kids potato/lemon cell. If all you want is a meter to read 12v, you can layer foils of two dissimilar metals,(say aluminum and copper) then tissue paper soaked in some form of electrolyte, and keep doing this until you reach your target voltage. This will technically be a battery. But It's not going have any lasting life, or be able to source any current. Not usable for an actual electronic device. You would be lucky to light a surface mount LED with it.
Real modern dry cell battery's use a paste of electrode material. This gives them more surface area and more material to chemically convert. Making and then containing this past takes much knowledge of inorganic chemistry and manufacturing. It took some thing like 100~200 years to go from Galvani's discovery of "animal electricity" to the first thing even coming close to a real useful battery. Not really encouraging for making your own.
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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