  In this paper we study the stability and quasi-normal modes of scalar
perturbations of black holes. The static charged black hole considered here is
a solution to Born-Infeld electrodynamics coupled to gravity. We conclude that
the black hole is stable. We also compare the stability of it with its linear
counter-part Reissner-Nordstrom black hole. The quasi-normal modes are computed
using the WKB method. The behavior of these modes with the non-linear
parameter, temperature, mass of the scalar field and the spherical index are
analyzed in detail.
