This study presents a rapid-charging aluminum-sulfur battery operating at 85°C using a quaternary molten salt electrolyte. The quaternary alkali chloroaluminate melt, with a low melting point of ~80°C, facilitates fast Al³⁺ desolvation and enhances the sulfur reaction kinetics. A nitrogen-functionalized porous carbon cathode further improves the battery's performance by accelerating sulfur conversion. The battery demonstrates excellent cycling stability with 85.4% capacity retention over 1400 cycles at a charging rate of 1C. The asymmetric sulfur reaction mechanism, involving the formation of polysulfide intermediates, is revealed through operando X-ray absorption spectroscopy, explaining the high reaction kinetics at such temperatures. This work opens up possibilities for practical applications of sustainable aluminum-sulfur batteries in both static and mobile energy storage, offering intrinsic safety and cost-effectiveness.This study presents a rapid-charging aluminum-sulfur battery operating at 85°C using a quaternary molten salt electrolyte. The quaternary alkali chloroaluminate melt, with a low melting point of ~80°C, facilitates fast Al³⁺ desolvation and enhances the sulfur reaction kinetics. A nitrogen-functionalized porous carbon cathode further improves the battery's performance by accelerating sulfur conversion. The battery demonstrates excellent cycling stability with 85.4% capacity retention over 1400 cycles at a charging rate of 1C. The asymmetric sulfur reaction mechanism, involving the formation of polysulfide intermediates, is revealed through operando X-ray absorption spectroscopy, explaining the high reaction kinetics at such temperatures. This work opens up possibilities for practical applications of sustainable aluminum-sulfur batteries in both static and mobile energy storage, offering intrinsic safety and cost-effectiveness.