OEMs and design engineers commonly consider the power supply, battery pack and charger as independent subsystems, rather than incorporating them as a unified system into the design process. This approach to product development often creates challenges leading to larger, inefficient rechargeable subsystems. This presentation outlines industry perceptions and practices, then presents the details of how these systems are really interdependent on one another and how developing them as a single system serves to reduce complexity, support use of the latest technologies, maximize performance, reduce product development risks, address regulatory considerations early in development and increase speed to market.