First, the general electrochemical behaviour of the different batches of [MPPip][TFSI] in contact with a Au(111) single crystal will be discussed, illustrating the dependence of the observed cyclic voltammetry peaks on the applied potential limits. Next, the influence of the different pre-treatments as well as the water content, will be shown. It should be noted that in this manuscript, we mainly show results for the IL denoted as batch 3. Similar trends were also observed for the other batches, which are indicated in the text and are depicted accordingly in the supporting information. The trends shown in this study are representative for several measurements which were performed in the same way. Comparing the individual measurements only showed negligible variations in the observed features.