  By employing the perturbative QCD (PQCD) factorization approach, we study the
quasi-two-body $B^0_{(s)}\to \eta_c{(2S)}\pi^+\pi^-$ decays, where the pion
pair comes from the $S$-wave resonance $f_0(X)$. The Breit$-$Wigner formula for
the $f_0(500)$ and $f_0(1500)$ resonances, and the Flatt\'e model for the
$f_0(980)$ resonance are adopted to parameterize the time-like scalar form
factors in the two-pion distribution amplitudes. As a comparison, Bugg's model
is also used for the wide $f_0(500)$ in this work. For decay rates, we found
the following PQCD predictions: (a) $ {\cal B}(B^0_s\to \eta_c(2S)
f_0(X)[\pi^+\pi^-]_s )=\left ( 2.67^{+1.78}_{-1.08} \right )\times 10^{-5}$
when the contributions from $f_0(980)$ and $f_0(1500)$ are all taken into
account; (b) ${\cal B}(B^0\to \eta_c(2S) f_0(500)[\pi^+\pi^-]_s)= \left ( 1.40
^{+0.92}_{-0.56} \right ) \times 10^{-6}$ in the Breit-Wigner model and $ \left
( 1.53 ^{+0.97}_{-0.61} \right ) \times 10^{-6}$ in the Bugg's model.
