TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The structural thermal bridge further includes: a first thermal plate positioned between the elongated sleeve housing and an end of the pair of adjacent energy storage devices, where the first thermal plate includes many recesses shaped to engage the end the pair of adjacent energy storage devices; and a second thermal plate positioned between the elongated sleeve housing and an opposing end of a different pair of adjacent energy storage devices, where the second thermal plate includes many recesses shaped to engage the opposing end of the adjacent pair of energy storage devices. The apparatus further comprises a thermal transmitting mechanism interposed between the elongated sleeve housing and the energy storage devices. The thermal transmitting mechanism comprises a material including resin, an epoxy, and a phase change material. The thermal plate includes an opening for a terminal coupled to the energy storage devices to pass through it. The thermal plate includes a recess shaped to engage to a bus bar coupled between a pair of the energy storage devices. The material composition of the structural thermal bridge and a physical structure of the structural thermal bridge are configured to provide a predetermined thermal transmission level. The elongated sleeve housing further comprises an interior mount configured to retain a circuit board in it. The thermal plates include many mechanically connected segments. In the apparatus one of the mechanically connected segments further includes a recess configured to engage an end of the energy storage devices and a substantially crescent-shaped bus bar in it. The mount includes a pair of opposing slots for engaging opposing edges of the circuit board. The interior of the elongated sleeve is configured to enclose two rows of energy storage devices. The interior of the elongated sleeve is further configured to enclose three pairs of adjacent energy storage devices. The housing further comprises: a thermal transmitting mechanism interposed between the elongated sleeve and each of the energy storage devices; and a structural thermal bridge positioned between the elongated sleeve and the energy storage devices, where the structural thermal bridge is configured to engage an end of a pair of adjacent energy storage devices to physically secure the energy storage devices and thermally communicate heat from it. In the energy storage device assembly each respective wiring harness includes many wires, and each respective wire in a wiring harness electrically couples the circuit board to one of a joint between energy storage devices and an end electrode of a respective energy storage device.