Why do you still feel tired, even after rest? In the modern world, fatigue is no longer just about lack of sleep. It is a system-level imbalance — a breakdown in how your body generates, distributes, and stabilizes energy. This book introduces a new way to understand your body: The Human Battery Model. Instead of viewing the body as isolated organs, this model explains your system as an energy network — with capacity, voltage, resistance, and recharge cycles. Inside this book, you will discover: • Why sleep alone does not fully restore your energy • How stress creates hidden energy resistance • What causes unstable energy and chronic fatigue • A practical closed-loop system to stabilize your energy This is not a medical guide. It is a system-level framework designed to help you observe, understand, and gradually rebalance your internal energy. If you are constantly tired, mentally drained, or unable to recover — this book will give you a new lens to understand what is really happening inside your body. Welcome to the Human Battery Protocol.