A reconfigurable battery system comprising: a plurality of battery circuits adjoined to each other, each battery circuit having: an negative input terminal; a positive output terminal; a battery cell with a positive battery terminal (+) and a negative battery terminal (-) interposed between the input terminal and the output terminal; a plurality of switches interconnecting the battery cell with a battery cell in an adjacent battery circuit, the plurality of switches including: - an input switch connected between the negative input terminal and the negative battery terminal of the battery cell; - a parallel switch connected between the positive output terminal and the positive battery terminal of the battery cell; - a bypass switch connected between the negative battery terminal of the battery cell and a negative battery terminal of an adjacent battery circuit; and - a series switch connected between the positive battery terminal of the battery cell and the negative battery terminal of the adjacent battery circuit; and a control unit that is configured to receives an output criteria and controls the switches in each of the plurality of battery circuits to form a circuit arrangement that meets the output criteria by outputting a voltage to at least two of the positive output terminals of the battery system while substantially maximizing power delivered by the circuit arrangement, where the output criteria defines a number of positive output terminals for the circuit arrangement and a voltage requirement for each positive output terminal. an negative input terminal; a positive output terminal; a battery cell with a positive battery terminal (+) and a negative battery terminal (-) interposed between the input terminal and the output terminal; a plurality of switches interconnecting the battery cell with a battery cell in an adjacent battery circuit, the plurality of switches including: - an input switch connected between the negative input terminal and the negative battery terminal of the battery cell; - a parallel switch connected between the positive output terminal and the positive battery terminal of the battery cell; - a bypass switch connected between the negative battery terminal of the battery cell and a negative battery terminal of an adjacent battery circuit; and - a series switch connected between the positive battery terminal of the battery cell and the negative battery terminal of the adjacent battery circuit; and - an input switch connected between the negative input terminal and the negative battery terminal of the battery cell; - a parallel switch connected between the positive output terminal and the positive battery terminal of the battery cell; - a bypass switch connected between the negative battery terminal of the battery cell and a negative battery terminal of an adjacent battery circuit; and - a series switch connected between the positive battery terminal of the battery cell and the negative battery terminal of the adjacent battery circuit; and a control unit that is configured to receives an output criteria and controls the switches in each of the plurality of battery circuits to form a circuit arrangement that meets the output criteria by outputting a voltage to at least two of the positive output terminals of the battery system while substantially maximizing power delivered by the circuit arrangement, where the output criteria defines a number of positive output terminals for the circuit arrangement and a voltage requirement for each positive output terminal.