Correlating complex characterisation methods with simpler ones that are more widely available and implementable can be a route to facilitate the monitoring of electrochemical systems. For example, Fordham et al. correlated spatially-resolved synchrotron X-ray diffraction (SXRD) and laboratory X-ray computed tomography (CT) measurements with thermal imaging and acoustic mapping of automotive battery cells to study heterogeneous effects of ageing, opening the way to the use of only acoustic signals once fully correlated with the richer but difficult to carry out X-ray techniques.