This disclosure relates to a battery arrangement for an electrified vehicle. Among other things, the battery arrangement includes first and second battery modules, each of which includes a battery module housing. Adjacent surfaces of these battery module housings are interlocked such that the first and second battery modules are configured to slide relative to one another in a transverse direction of the electrified vehicle. Accordingly, this disclosure increases safety while saving space and without requiring undue reinforcements of the chassis structure, which would increase the weight of the vehicle and reduce the energy efficiency the vehicle. These and other benefits will be appreciated from the following description.