How may joules of energy are in a typical 9V battery?

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More to the point, how many joules can one get out of a typical 9V battery. This varies somewhat depending upon the load. At low drain currents, (2mA), a typical manganese alkaline 9V battery will provide around 16,000J over its lifetime, assuming it starts out fresh and is discharged to 1V per cell. One can squeeze out a little - not much - more if you run it down to completely dead.

At a 10mA draw, you drop down below 15,000J, at 100mA, only about 12,000J.

The above is based on discharge curves for Duracell MN1604

First answer by Canonimous. Last edit by Canonimous. Contributor trust: 7 [recommend contributor]. Question popularity: 6 [recommend question]

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