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A modular battery assembly includes at least a first battery pack and a second battery pack. Each battery pack includes a container at least partially enclosing a first plurality of electrical storage devices, an attachment mechanism configured to removably attach the first container to a chassis of

A modular battery assembly includes at least a first battery pack and a second battery pack. Each battery pack includes a container at least partially enclosing a first plurality of electrical storage devices, an attachment mechanism configured to removably attach the first container to a chassis of a vehicle, a mechanical connector, and an electrical connector configured to connect the plurality of electrical storage devices to a control section of the vehicle. The battery pack containers are configured to be removably attached to each other by connection of the mechanical connectors.

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1. A modular battery assembly, comprising: a first battery pack comprising: a first container at least partially enclosing a first plurality of electrical storage devices;a first attachment mechanism to removably attach the first container to a chassis of a vehicle;a first mechanical connector; anda

1. A modular battery assembly, comprising: a first battery pack comprising: a first container at least partially enclosing a first plurality of electrical storage devices;a first attachment mechanism to removably attach the first container to a chassis of a vehicle;a first mechanical connector; anda first electrical connector to connect the first plurality of electrical storage devices to a control section of the vehicle; anda second battery pack comprising: a second container at least partially enclosing a second plurality of electrical storage devices;a second attachment mechanism to attach the second container to the chassis of the vehicle;a second mechanical connector; anda second electrical connector to connect the second plurality of electrical storage devices to the control section of the vehicle,wherein the first and second containers each include a pair of longitudinal sidewalls and a pair of transverse endwalls which define a perimeter thereof,wherein the first mechanical connector is on a first longitudinal sidewall of the pair of longitudinal sidewalls of the first container,wherein the second mechanical connector is on a first longitudinal sidewall of the pair of longitudinal sidewalls of the second container,wherein the first container is removably attached to the second container by connection of the first and second mechanical connectors,wherein the first longitudinal sidewall of the second battery pack includes a slot,wherein the second mechanical connector is located in the slot, andwherein the first mechanical connector protrudes from the first longitudinal sidewall of the first container into the slot and connects with the second mechanical connector to secure the first container to the second container. 2. The modular battery assembly of claim 1, wherein the pairs of longitudinal sidewalls are longer than the pairs of transverse end walls, and wherein the first longitudinal sidewall of the first container and the first longitudinal sidewall of the second container each have cutout portions such that when the first container and the second container are connected to one another stepped surfaces create a channel that accommodates a cross rail of the chassis of the vehicle. 3. The modular battery assembly of claim 1, wherein the first attachment mechanism and the second attachment mechanism are secured to the transverse endwalls of the first and second containers, wherein the first mechanical connector is located closer to a first edge of the first longitudinal sidewall than a second edge of the first longitudinal sidewall that is opposite the first edge. 4. The modular battery assembly of claim 3, wherein the first attachment mechanism and the second attachment mechanism each include a pair of receiving members to receive a striker attached to the chassis of the vehicle, each receiving member including a latching hook for automatically attaching the striker to the receiving member when the striker is in the receiving member. 5. The modular battery assembly of claim 1, wherein the slot penetrates the first longitudinal sidewall from a first surface of the second container to a second surface of the second container that is opposite the first surface. 6. The modular battery assembly of claim 5, wherein the first mechanical connector is a striker and the second mechanical connector is a receiving member including a latching hook for automatically attaching the striker to the receiving member when the striker is in the receiving member. 7. The modular battery assembly of claim 1, wherein the second battery pack further includes an opposing second mechanical connector on a second longitudinal sidewall of the second container, the opposing second mechanical connector configured to secure the second container to a third battery pack. 8. The modular battery assembly of claim 7, further comprising: the third battery pack comprising: a third container at least partially enclosing a third plurality of electrical storage devices;a third attachment mechanism to removably attach the third container to the chassis of the vehicle;a third mechanical connector; anda third electrical connector to connect the third plurality of electrical storage devices to the control section of the vehicle,wherein the third container is removably attached to the second container by connection of the third and opposing second mechanical connectors. 9. The modular battery assembly of claim 8, wherein the opposing second mechanical connector is inserted into the third mechanical connector to secure the second container to the third container. 10. The modular battery assembly of claim 8, wherein the first mechanical connector is interchangeably connectable to the second mechanical connector and the third mechanical connector. 11. The modular battery assembly of claim 1, wherein the first longitudinal sidewalls of the first and second containers include a cutout portion, and wherein a pair of cutout portions define a channel for receiving a cross rail when the first container is adjacent to the second container. 12. The modular battery assembly of claim 1, further including a bus bar connecting the first electrical connector to the second electrical connector, the bus bar connecting the first plurality of electrical storage devices and the second electrical storage devices to each other in parallel.