Following the route of synthesis of β-MoO3 through soft chemistry methods a new amorphous material with composition MoO3·2H2O has been detected. The hydrated molybdenum oxide showed the capacity for electrochemical lithium insertion. The maximum amount of lithium incorporated in this material (∼3.3Li/Mo) leads to a specific capacity of 490Ahkg−1. The charge–discharge curve showed a good reversibility in the potential range from 3.2 to 1.1V versus Li+/Li0 where the cell voltage decreased monotonously as a function of the degree of lithium inserted. The electrochemical features of amorphous MoO3·2H2O suggest that it can be considered as a possible cathode candidate in rechargeable lithium batteries.