Modular rack battery system

A device for stacking and connecting batteries, the device comprising:

• a plurality of batteries connectable in series and arranged in a vertically stacked configuration, each of the batteries comprising opposite first and second lateral faces, a positive terminal and a negative terminal, the terminals being located adjacent the first face, the first and second lateral faces each having nesting topography thereon;
• a first substantially vertically oriented sideplate having nesting topography thereon configured to receive the nesting topography of the first faces of the batteries and an electrical connector connected to a positive terminal of one battery and a negative terminal of an adjacent battery;
• and
• a second substantially vertically oriented sideplate having nesting topography configured to receive the nesting topography of the second faces of the batteries.