  We considered a new renormalization condition for the vacuum expectation
values of the scalar and spinor currents induced by a homogeneous and constant
electric field background in de Sitter spacetime. Following a semiclassical
argument, the condition named maximal subtraction imposes the exponential
suppression on the massive charged particle limit of the renormalized currents.
The maximal subtraction changes the behaviors of the induced currents
previously obtained by the conventional minimal subtraction scheme. The maximal
subtraction is favored for a couple of physically decent predictions including
the identical asymptotic behavior of the scalar and spinor currents, the
removal of the infrared (IR) hyperconductivity from the scalar current, and the
finite current for the massless fermion.
