Finding a new battery chemistry is of urgent importance to reply diverse deployment trends of battery-driven devices. Here we propose a strategy to configure dual-ion storage battery based on SO2 solvated chloroaluminate molten salt complex electrolyte employing Cu2O cathode material. The proposed battery chemistry is proven by two different couples of dual-ion (Li/Cl and Na/Cl) batteries that show about 590 Wh kg−1 based on Cu2O mass with working voltage of 3.4 V as well as highly stable cycle performance up to 300 cycles. Further improvement may be possible by optimizing the electrode material with the compatible electrolyte composition, thus being another alternative to address various requirements of next-generation battery for future applications.