State of Charge
WARNING: This page is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
The battery energy control module (BECM) uses a complex calculation method based on varying conditions over a range of operation to determine and update the state of charge (SOC) of the hybrid battery. The hybrid battery parameters used by the BECM include current, voltage, and temperature. These inputs are monitored by several sensors within the hybrid battery assembly.