This presentation and live demonstration from Altair and battery specialist Danecca showcases a Digital Twin which presents a virtual representation of a physical battery pack subject to a transient duty cycle. The Digital Twin mimics the embedded control logic of the hardware to manage system heating and cooling during the event. Capturing the complex physics and system response with the Digital Twin in timescales commensurate with the physical hardware enhances the role of simulation within the UK battery development community. The battery Digital Twin presents new opportunities for rapid, holistic, design exploration and innovation.