The generator battery carrier subsystem provides the capability to store electrical energy as chemical energy to provide the energy required by the Energy Management System. The generator battery carrier shall monitor the energy exchange along the 42-volt bus internal to the generator battery carrier and to provide status information to the hybrid control module (HCM). The 3 valve-regulated lead-acid batteries provide power for the 42-volt system. The "deep cycle" batteries employ Absorbent Glass Mat technology, specifically designed for hybrid vehicles, and are tailored to GM performance requirements. Lead-acid batteries are less costly to replace than nickel-metal hydride batteries or other battery technologies. They have a 50-55 amp hour Ahr. capacity and a projected 4-year life. The batteries are stored in a single energy storage module mounted under the rear seat. They power the electro-hydraulic power steering (EHPS) and the starter/generator. A conventional under-hood battery powers all the other electrical items, like the lighting, the driver information center (DIC) and the Infotainment system. The generator battery carrier physical content as follows:

The generator battery carrier functional content as follows:

Important: The Panasonic HV1255 VRLA batteries used in service will have approximately 80 percent state of charge (SOC) when shipped from the manufacture. BEFORE battery replacement, both the battery pack and faulty battery must be fully charged at the pack level (together) to ensure the vehicle battery pack will be equally balanced and charged. The new replacement battery will be charged to 100 percent SOC using the J 42634 Battery Module Charger before installation. Refer to Battery Charging . The Service Charge Procedure MUST be performed at the pack level if: