Battery Load Shed
WARNING: This page is about a different car, the 2016 Ford Transit Connect. However, it is still accessible from the selected car via links, so may be relevant.
On vehicles equipped with the 1.6L engine only, the BCM uses the battery monitoring sensor to keep track of the battery state of charge in order to save the remaining battery charge when necessary.
Refer to: Charging System - 1.6L EcoBoost (132kW/180PS) - Sigma - System Operation and Component Description