In the typical mode of operation, requests are posted by the optimiser. To investigate whether an electrolyte formulation optimised for ionic conductivity also yields an optimised EOL, additional requests are manually posted to FINALES during the multi-task phase. These manually posted requests include the formulation optimised for ionic conductivity and two non-optimised formulations as identified in the single-task phase. It must be noted that the predicted optimised formulations used for the manual requests in the multi-task phase differ from the optimised formulations reported in Figure and Table SI-3, since the model is retrained after each iteration and therefore the predictions based on a model trained later differ from earlier models. The electrolyte formulations included in the manually posted requests are reported in Table