  In the present work we study the semileptonic decays of $\bar B_s$ mesons in
the context of nonrelativistic constituent quark models. We estimate the
uncertainties of our calculation using different interquark potentials to
obtain the meson wave functions. We check the results from our model against
the predictions of Heavy Quark Symmetry, in the limit of infinite heavy quark
mass. We also study the nonleptonic decays of $\bar B_s$ mesons within the
factorization approximation.
