At the recent 2025 Zhongguancun Forum Annual Meeting, humanoid robots became the most beautiful stars, active in various scenes such as welcoming guests, communicating, hosting, performing, and serving, waving their hands, writing poetry and painting, or playing musical instruments. Since the beginning of this year, with the assistance of embodied intelligence technology, humanoid robots have accelerated their iterative evolution and gradually expanded their application scenarios in production and daily life. When we marvel at the changes brought by humanoid robots, few realize that behind these steel bodies is an invisible "lifeline" - energy. When humanoid robots step out of science fiction movies, who will charge them and "extend their lives"? Humanoid robots are made of steel, and electricity is the blood that flows through them. There are currently two main energy supply methods for providing long-lasting power to robots: with cables and without cables. In cable based systems, robots need to obtain energy from power stations through transmission lines or pipelines. Although this method is stable, it also limits the robot's range of movement. In the cable free mode, robots maintain their "life" through the energy they carry or generate, making their range of motion more flexible. Humanoid robots usually use the latter method as a power source, which provides a wider range of activity space but greatly reduces their endurance. Humanoid robots have a human like appearance and behavior, capable of walking, running, jumping, grabbing, and operating tools. Compared to bionic quadruped robots, humanoid robots require more powerful motors, more body degrees of freedom, and more complex control algorithms, which also means they require more energy support. Moreover, as the functions of humanoid robots continue to increase, such as the configuration of more advanced sensors, more complex control systems, and a greater number of chips, energy consumption issues will be further highlighted. The stronger the "steel body" of a robot, the heavier the load on the "electric heart". Although we have made some breakthroughs in the field of electric vehicles, humanoid robots have more stringent requirements for batteries. The internal space of humanoid robots is narrow, requiring batteries with high energy density; Humanoid robots have frequent movements and require high rate discharge capability of the battery, which can quickly provide high current; The working environment of humanoid robots is complex and diverse, requiring batteries to have good environmental adaptability and a long lifespan. The current battery technology still cannot meet the requirements of long-term and high load work for future humanoid robots in these aspects. In practical applications, whether it is logistics handling in factories or household chores, robots need to frequently stop and charge. The relatively low work efficiency obviously cannot meet people's expectations for robots, and the "battery level anxiety" has become a concern in the industry. If the high energy consumption problem of fixed facilities such as data centers can be solved by stacking power resources, the problem of mobile energy supply for robots seems to be even more difficult to overcome. People generally believe that technologies such as artificial intelligence and machine vision are the main issues in the development of humanoid robots, but the fact shows that battery life is the biggest bottleneck restricting the deployment of humanoid robots. How to provide sufficient and stable energy for humanoid robots? Breakthrough in battery technology is the key to solving power bottlenecks. Some research institutions and enterprises are researching new battery materials and technologies, which are expected to significantly improve energy density and charging speed without increasing the volume. If the new battery can be successfully applied to humanoid robots, it will greatly extend their battery life. In addition to the improvement of battery materials, battery management systems are also crucial. By intelligently managing battery charging and discharging, and dynamically adjusting battery output power based on the robot's working status, battery lifespan and efficiency can also be improved. Of course, if we can accelerate the charging speed and find a balance between charging capacity and working time, the length of a single battery life will not be so important. If we dare to imagine again: one day we will equip humanoid robots with "liquid hydrogen hearts" or even "nuclear hearts", and the problem of endurance will be better solved. There is also room for optimization in the mechanical power of humanoid robots. By adopting more efficient motors and drive systems, energy loss can be reduced. By optimizing the robot motion control algorithm, its movements can be made smoother and more natural, and energy consumption can also be reduced. In addition, energy consumption can be reduced by reducing the weight of humanoid robots. For example, using lightweight materials to manufacture robot shells and structural components can not only improve the flexibility of robots, but also reduce battery burden. The future of humanoid robots is full of infinite possibilities. The breakthrough of power bottlenecks will be the key to unlocking this future. With the continuous advancement of energy replenishment technology and continuous optimization of robot design, humanoid robots are expected to "go further and further". (New Society)