By using the formulae obtained in Part I for the calculation of the binding energy of 7Li a numerical estimate of the binding energy of 7Li is made in accordance with the variational method, the wave function being chosen rather roughly. The results here are also in favour of the two range potential considered previously by Peng and Chang, and in particular the results indicate that the ratio of the two ranges of the nuclear potential may be not less than 3, as in the case for 6Li treated above, Part II.