A battery assembly, or module, for a vehicle having a battery compartment that defines an opening in the floor. The battery module is disposed partially within the battery compartment and extends through an opening in the floor of a battery compartment to be partially disposed below the floor of the vehicle. A method of installing a battery module into a vehicle is also disclosed. The battery module is inserted partially into an opening in a floor of a battery compartment with a lower portion of the battery module being retained below the floor and an upper portion of the battery module being retained above the floor. A seal is attached between the battery module and the opening in the floor.