We propose to use two days of beamtime on POLARIS to carry out the first analysis of the Pair Distribution Function of lithium-conducting garnets. These materials show outstanding Li+ conductivity and electrochemical stability making them strong candidates for operation as electrolytes in an all solid-state battery. Rietveld analysis combined with solid state NMR, computer simulation and electrochemical measurements have identified Li+ distributed across multiple sites in the structure with a large degree of occupational disorder. The correlation between the occupancies of these sites can only be determined by neutron PDF and is crucial in understanding whether the Li+ conduction mechanism involves isolated Li+ ions or the formation of local clusters throughout the material.