Abstract: A controller for hybrid vehicles. Embodiments disclosed herein relate to hybrid vehicles, and more particularly to controller systems in hybrid vehicles. Embodiments herein disclose a design and apparatus for a hybrid control unit and a battery monitoring sensor. Embodiments herein disclose a controller for controlling a hybrid automotive vehicle including an engine and an electric motor as drive power sources for driving the vehicle, and an electric generator operable by the engine to charge a battery while the engine drives the vehicle. Embodiments herein disclose a control unit integrated with the battery sensor.