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The invention provides for a high occupancy or heavy-duty vehicle with a battery propulsion power source, which may include lithium titanate batteries. The vehicle may be all-battery or may be a hybrid, and may have a composite body. The vehicle battery system may be housed within the floor of the v

The invention provides for a high occupancy or heavy-duty vehicle with a battery propulsion power source, which may include lithium titanate batteries. The vehicle may be all-battery or may be a hybrid, and may have a composite body. The vehicle battery system may be housed within the floor of the vehicle and may have different groupings and arrangements.

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1. A low-floor electric bus comprising: a floor made of a composite material, wherein a bottom surface of the floor includes one or more cavities; anda battery power source mounted under the floor of the low-floor electric bus such that the floor inside the bus in an area that extends substantially

1. A low-floor electric bus comprising: a floor made of a composite material, wherein a bottom surface of the floor includes one or more cavities; anda battery power source mounted under the floor of the low-floor electric bus such that the floor inside the bus in an area that extends substantially an entire width of the bus between a front axle and a rear axle of the bus is substantially flat, wherein the battery power source includes a plurality of battery packs mounted in the one or more cavities such that one or more of the plurality of battery packs form exposed surfaces of an underside of the low-floor electric bus. 2. The low-floor electric bus of claim 1, wherein each battery pack of the plurality of packs has a height of 8 inches or less. 3. The low-floor electric bus of claim 2, wherein each battery pack of the plurality of battery packs has a height of 6.75 inches or less. 4. The low-floor electric bus of claim 1, further including a battery power source mounted on a roof of the bus. 5. The low-floor electric bus of claim 1, wherein the composite material of the floor comprises a first skin and a second skin with a core sandwiched between the first and the second skins. 6. The low-floor electric bus of claim 5, wherein the first and the second skins include fiber glass and the core includes balsa wood. 7. The low-floor electric bus of claim 1, wherein the one or more cavities permit mounting of the plurality of lithium titanate battery packs into the one or more cavities from below the underside of the low-floor electric bus. 8. The low-floor electric bus of claim 1, wherein the battery power source includes a plurality of lithium titanate battery packs. 9. The low-floor electric bus of claim 1, wherein the battery power source is configured to be charged to over 90% state of charge in ten minutes. 10. A low-floor electric bus, comprising: a body made of a composite material;a low-floor structure made of a composite material formed below a floor of the bus, wherein a bottom surface of the low-floor structure includes one or more cavities; anda battery power source configured to be charged to over 90% state of charge in ten minutes, the battery power source being positioned in the one or more cavities such that a battery power source forms an exposed surface of an underside of the low-floor electric bus and the floor inside the bus in an area that extends substantially an entire width of the bus between a front axle and a rear axle of the bus is substantially flat. 11. The low-floor bus of claim 10, wherein the battery power source includes a plurality of battery packs, the plurality of battery packs including one or more lithium titanate battery packs. 12. The low-floor bus of claim 11, wherein the plurality of battery packs includes one or more battery packs having a battery chemistry different from the one or more lithium titanate battery packs. 13. The low-floor bus of claim 11, wherein each battery pack of the plurality of lithium titanate battery packs has a height of 8 inches or less. 14. The low-floor electric bus of claim 10, wherein the composite material of the body comprises a first skin and a second skin with a core sandwiched between the first and the second skins, and wherein the first and the second skins include fiber glass and the core includes balsa wood. 15. The low-floor electric bus of claim 10, wherein the one or more cavities permit mounting of the battery power source into the one or more cavities from below the underside of the low-floor electric bus. 16. A low-floor electric bus, comprising: a body formed from a composite material as one piece;a detachable drive assembly including a drive motor coupled to a rear of the body;a floor made of a composite material, wherein a bottom surface of the floor incudes one or more cavities; anda battery power source configured to provide power to the drive motor, the battery power source including a plurality of battery packs mounted in the one or more cavities such that the floor inside the bus in an area that extends substantially an entire width of the bus between a front axle and a rear axle of the bus is substantially flat, and one or more battery packs of the plurality of battery packs form exposed surfaces of an underside of the low-floor electric bus, wherein each battery pack of the plurality of battery packs have a height of 8 inches or less. 17. The low-floor electric bus of claim 16, wherein the composite material of the body comprises a balsa wood core sandwiched between fiber glass skin layers. 18. The low-floor electric bus of claim 16, wherein each battery pack of the plurality of battery packs is mounted in a cavity of the one or more cavities. 19. The low-floor electric bus of claim 16, wherein the plurality of battery packs includes one or more lithium titanate battery packs. 20. The low-floor electric bus of claim 16, wherein the battery power source is configured to be charged to over 90% state of charge in ten minutes.