A system for swappable battery pack for electric vehicle is disclosed. Each battery pack units is comprising a battery compartment housing, a battery carrier rack which is slidable within the battery compartment housing via at least one linear actuator. The battery carrier rack also contains a plurality of modulated battery packs nested into its docking enclosures. In order to transfer or swap the modulated battery packs, the slidable battery carrier rack must projects out from its compartment in predetermined direction and distance and then the nested modulated battery packs can easily be detached from its docking enclosures.