An investigation of eutectic electrolyte mixtures for low-temperature aluminium batteries led by Jonah Wang was published today. This work uses a combination of NMR spectroscopy and electrochemical methods to understand the electrolyte speciation and monitor the cycling performance, both for electrodeposition, and also in aluminium-graphite cells. We show operation down to -40 °C in the ternary AlCl3-urea-[EMIm]Cl mixture at a mole ratio of 1.3-0.25-0.75. In addition to supressing the freezing point, the addition of urea to the binary mixture of AlCl3-[EMIm]Cl improves the cost effectiveness of such electrolytes.