A power system for an electric vehicle including a firewall positioned between an engine compartment and a passenger compartment of the vehicle. A floor structure of the vehicle is coupled with the firewall and defines an aperture between the firewall and a central support beam of the floor structure. A battery assembly is configured to mount with an underside of the floor structure having a battery and a battery connector housing to house a battery connector. The connector housing defines an electric connector to couple with an electric system of the vehicle. The connector housing is inserted within the aperture of the floor structure such that at least a portion of the battery connector housing extends above the floor structure. A rigid tunnel is coupled with the firewall, the floor structure, and the central support beam to cover the portion of the connector housing that extends above the floor structure.