A promising metal-air secondary battery based on aluminium-oxygen couple is described. In this paper, we observed that an aluminium-air battery employing EMImCl, AlCl3 room temperature ionic liquid (RTIL) as electrolyte and aluminium as negative electrode, has an exceptional reduced self-discharged rate. Due to its new and innovative type of electrolyte, this aluminium-air battery can support relatively high current densities (up to 0.6 mA cm(-2)) and an average voltage of 0.6-0.8 V. Such batteries may. find immediate applications, as they can provide an internal, built-in autonomous and self-sustained energy source. (C) 2014 Elsevier B.V. All rights reserved.