In the field of 'hydrogen storage and generation', ammonia borane NH3BH3 (AB) destabilization can be achieved by adding a metal halide, here copper chloride (CuCl2). Improved dehydrogenation properties can be achieved with a fresh mixture of CuCl2-NH3BH3. Using a systematic approach, we followed the stability of the mixture using thermogravimetric analysis, differential scanning calorimetry and (micro) gas chromatography while it was stored under argon at room temperature over 6 months. The aged samples showed improved dehydrogenation properties compared to pristine AB. However, the performance deteriorated in comparison to the fresh mixture indicating that CuCl2-NH3BH3 evolves over time, decomposing with slow kinetics. This is detrimental in terms of stability during storage, making long-term storage of CuCl2 inconceivable for safety and performance reasons. This is discussed herein. (C) 2012 Elsevier B.V. All rights reserved.