  In this paper I study stationary, spherically symmetric accretion of fluids
onto a charged black hole in the presence of the cosmological constant. For
some isothermal equations of state it is possible to obtain analytic solutions.
In the case of a radiation fluid I point out a connection between locations of
the horizons and the sonic (critical) points. In specific cases the solutions
form closed, binoculars-like trajectories in a phase diagram of the velocity
vs. radius.
