a vehicular battery system includes a vehicular battery system stack including at least one negative electrode including a form of lithium , an oxygen reservoir having a first outlet operably connected to the vehicular battery system stack , a multistage compressor having a first inlet operably connected to the vehicular battery system stack , and a second outlet operably connected to a second inlet of the oxygen reservoir , and a cooling system operably connected to the multistage compressor and configured to provide a coolant to the multistage compressor to cool a compressed fluid within the multistage compressor .