Engineer and 1 Researcher who had all experience in battery manufacturing in the pilot line of our lab) to use the device in real electrode manufacturing conditions and we observed a number of difficulties in terms of legibility, arm and neck pain during use, mental workload and visual fatigue. We also worked on safety to guarantee the safety of MR users in the experimental rooms when handling (dangerous) chemicals. Usually, experimenters have to wear personal protective equipment (PPE) such as a gown, gloves, goggles or a mask to avoid breathing in vapor or powders. We found out that the fixed position of the panels could be dangerous. We also fixed the QR codes so that the holographic panels were in front of the eyes and above the lab benches, but it turned out that this position was inconvenient because the user had to stretch his/her arm out in front of him/her, and dangerous because he/she was leaning over the bench and there was a risk of spilling a chemical product. This was not acceptable, so we felt that it would be better to leave users free to choose the position according to their preference and the characteristics of the situation. Furthermore, the use of MR made it easier and quicker to manufacture the electrodes, as users no longer had to search for information in their notes or laboratory notebooks or enter their data in Excel-like files on computers, as all the necessary information and data collection functionalities were presented right in front of their eyes. We also observed that users had very positive impressions of the device after use, particularly in terms of its usefulness and attractiveness . In order to fix the problems detected in the first version, we designed a second version (V.2) of our MR application, based on users' feedback from usability testing and input from future users at several stages of the MR design process (Figure .2)). The V.2 was finalized in October 2022. V.2 was brighter and the vocabulary was adapted to the language used by experimentalists (e.g. weight change in mass). We have also added some missing information, such as the possibility of inputting the thickness and mass of samples to characterize the electrode after calendering. V.2. enabled data to be entered quickly and easily and stored on a dedicated server, so that it can retrieve the information from its computer in his/her office. To make data entry easier, we added a panel tracking feature to give users the option of positioning the panel where they want it and tracking it in real time. We also worked on the quality of the interface and the reactivity of the system to create a better, more memorable customer experience. We had seen from the user tests carried out in the previous version that responsiveness was an essential element, and that a lack of responsiveness could be a hindrance. We therefore tested the prototype on the prototyping line 3 times with the group's ergonomics specialist and people new to MR.