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# Re: [Phys-l] How much energy can a battery discharge

Without thinking about the calculations, I can tell you that your result is a lot different than reality. A typical Nickel-Metal-Hydride rechargeable AA cell (which is considerably more energy than a AA alkaline cell) is about 2 amp hours, and it is perhaps as big as 5 sugar cubes. Therefore, your result is off by at least 50-fold.

Michael D. Edmiston, Ph.D.
Professor of Chemistry and Physics
Bluffton University
1 University Drive
Bluffton, OH 45817
419.358.3270
edmiston@bluffton.edu

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From: "paul beach" <sniffyraven@fastmail.fm>
Sent: Friday, October 24, 2008 12:01 AM
To: <phys-l@carnot.physics.buffalo.edu>
Subject: [Phys-l] How much energy can a battery discharge

How much energy can a Battery Hold? Can I just divide grams-moles by
Coulumbs?

1 Coulumb = 6.2 x 10^18 electrons or 1 A / sec
Avogadro's number = 6.02 x 10^23 gram-moles

Coulumbs for a gram-mole = 6.02*10^23 / (6.2*10^18)
= 97096.77419

Divide by 60*60 to get amp hours = 26.97132616

Therefore something the size or mass of a sugar cube, could give about
27 amp hours on the negative terminal.
--
paul beach
sniffyraven@fastmail.fm

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