  We study the canonical energy-momentum tensor of the spherically symmetric
$U(1)$ gauged Q-ball configurations in the two-component
Fridberg-Lee-Sirlin-Maxwell model, and in the one-component scalar model with a
sixtic potential. We evaluate the distributions of the corresponding shear
forces and pressure and study the stability criteria for these solutions. It is
shown that the electrostatic repulsion may destabilize the $U(1)$ gauged
Q-balls. However, in the limiting case of the Fridberg-Lee-Sirlin-Maxwell model
with a long ranged real scalar component, the gauged Q-balls always remain
stable.
