Abstract: A battery cell holder having terminal electrodes and a frame configured to support a plurality of battery cells in contact with the terminal electrodes. The frame having a base plate, a top plate, and at least one side support extending from the base plate to the top plate, the frame configured to support the plurality of battery cells between the base plate and top plate, wherein the terminal electrodes comprise a strip of conductive material configured to contact an electric terminal of one of the battery cells.

Abstract: There is provided a battery system comprising a control system (102, 131, 41) and a plurality of sub-batteries (130) that have different battery chemistries to one another, resulting in different discharge characteristics to one another. The plurality of sub-batteries (130) are connected in parallel to one another for delivering power to an output (107), wherein each sub-battery comprises a plurality of cell modules (140) for connecting in series with one another to form a series circuit. The control system is configured to switch ones of the cell modules (140) in and out of the series circuits to control how many cell modules are connected in each series circuit, thereby controlling which ones of the sub batteries contribute most power to the output (107). A method for managing the battery system is also provided.