Determining Density of Li Battery

How do I determine the energy density (wh/kg) of the Li ion battery?

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The Specific energy density  can be calculated by integrating from 0 to tcutoff (time to reach the cut off potential) the expression V(t)*i*A dt and then dividing for (3600*Mw).In this way you can obtain the specific energy density in Wh kg-1.
[In the expression: i is in A m-2, A is in m2, V in volts, t in seconds and Mw is the molecular weight in Kg]
Graphically, it is the area under the voltage vs. specific capacity curve.

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