A series of novel donor-acceptor polymers has been precisely designed and synthesized. Among them gFBT-g2T showed the highest normalized peak transconductance (gm,norm) of 298±10.4 S cm−1 and a product of charge-carrier mobility and volumetric capacitance (μC*) of 847 F V−1 cm−1 s−1, which was comparable with state-of-the-art materials. gFBT-g2T also exhibited exceptional ultra-high temperature stability, maintaining the outstanding electrochemical performance even after undergoing the standard autoclave steam sterilization procedure.