Abstract: Lithium batteries of this capacity are typically built of cells that are connected with spot welding. Should one cell fail an entire battery must be discarded. The design of these “Blocs” allows cells to be replaced. The individually replaceable cells allow the battery to be repaired, rebuilt and upgraded unlike spot welded batteries. The unique open top case design allows the Blocs can be assembled in any configuration. Connections between Blocs are made with conductive plates which can be dissasembled and provide structural support. The magnets used form button tops for the cells and allow the Blocs to be “snapped” together, The non-conductive bolts provice compressive force making good electrical connection between the cell, magnets, and rigid parallel plates. The plastic magnet holders keep the magnets from drifting and isolate the negative charged case from the positive terminal.