  Weak singlet charged scalar exists in many new physics models beyond the
Standard Model. In this work we show that a light singlet charged scalar with
mass above 65~GeV is still allowed by the LEP and LHC data. The interactions of
the singlet charged scalar with the Standard Model particles are described by
operators up to dimension-5. Dominant decay modes of the singlet charged scalar
are obtained, and a subtlety involving field redefinition and gauge fixing due
to a dimension-5 operator is also clarified. We demonstrate that it is
promising to observe the singlet charged scalar at the LHC.
