The current average battery life of mainstream humanoid robots worldwide is 2 to 4 hours.

At the 2026 World Artificial Intelligence Conference, the general manager of an energy company pointed out six major challenges in the industry: short battery life, limited payload capacity, tight internal space, long charging time, prominent safety risks, and high dynamic motion-induced instantaneous high-power demand. "But these can be attributed to two core contradictions - insufficient battery capacity and safety challenges."

As humanoid robots move from the laboratory to homes and factories, "battery anxiety" has become the most realistic "obstacle" for their large-scale implementation.

1. The "inherent predicament" of humanoid robot charging

The charging problem of humanoid robots is more challenging than imagined.

Natural battery capacity shortcoming. Limited by the energy density of current liquid batteries, combined with the limited internal space of the humanoid robot's body and the need for strict weight control of the entire machine, the battery capacity of most products is below 2 kWh. The YuShu H1 battery is only 0.864 kWh, with a static battery life of less than 4 hours; the battery capacity of the Tesla Optimus Gen2 is 2.3 kWh, and in dynamic working conditions such as walking and operation, the actual available battery life is only about 2 hours.

Incredible static power consumption. What's more special is that most of the current humanoid robot drive joints lack mechanical self-locking structures. Even if standing still, the hip, knee, and other joints still need to continuously output torque to resist gravity and maintain body balance. Just maintaining a standing posture can consume up to 200 to 300 watts of power. A robot with a battery capacity of less than 2 kWh can consume its power just by standing.

Inadequate charging methods. Traditional plug-in charging or fixed contact charging is limited by physical interface wear and alignment accuracy. The traditional charging method using exposed connectors and cables may cause inconvenience, be prone to mechanical wear, and be difficult to effectively protect in dusty, dirty, or frequently human-machine interaction environments. For humanoid robots that require unmanned regular charging, the exposed cables will also cause safety and maintenance risks.

2. Wireless charging: A feasible path for humanoid robot energy replenishment

Facing "battery anxiety", the industry is exploring alternative routes such as battery swapping, semi-solid batteries, and all-solid batteries. However, each route faces its own challenges - battery swapping requires supporting charging stations and backup batteries, which are costly to deploy; solid-state batteries are still a long way from large-scale production.

Meanwhile, wireless charging is becoming a highly regarded technical route.

In January 2026, an artificial intelligence company introduced a foot-sensing wireless charging technology for its humanoid robots. The charging coil embedded in the robot's foot allows it to achieve 2 kilowatt power charging simply by stepping onto the wireless charging base. The company's CEO stated: "In the home scenario, this means the robot can automatically return for charging at any time throughout the day."

The company's sensing charging solution aims to eliminate most of these inconveniences, enabling the robot to achieve more sustained operation without human intervention.

A fixed docking station with wireless power transmission is a feasible alternative to plug-in charging. When the humanoid robot completes its task or runs out of battery, it can return to the designated location, align itself, and start charging during its idle period. This solution supports a sealed mechanical design and can achieve more predictable and repeatable charging behavior in consumer and industrial environments.

The core value of wireless charging lies in: non-contact - eliminating physical interface wear and the risk of electric sparks; automation - the robot can autonomously return for charging without human intervention; sealed design - no exposed conductors, suitable for dusty, humid, and other complex environments.

III. WIRELESSPT: Providing an Assessable Wireless Charging Solution for Humanoid Robots

WIRELESSPT was founded in 2014 and focuses on the research and production of high-power, industrial-grade wireless charging products. The company holds over 100 patents in the field of wireless charging, including 45 authorized invention patents; the product power ranges from 180W to 6000W, and can be extended to 12kW and 20kW; it has a 2000-square-meter automated factory in Yantai, Shandong Province, with an annual production capacity of 20,000 sets.

In response to the special charging requirements of humanoid robots, WIRELESSPT can provide an assessment and customized development of wireless charging solutions based on magnetic coupling resonance technology.

The charging requirements of humanoid robots are significantly different from those of industrial AGVs: the battery capacity is generally less than 2kWh, but the static power consumption is high and the replenishment frequency is high; the internal space of the torso is extremely limited, and there are strict constraints on the volume and weight of the receiving end; the charging posture is diverse (standing, squatting, etc.), and higher requirements are placed on the charging freedom.

WIRELESSPT's technical reserves precisely address these challenges. Based on the PTSmart™ parity-time symmetry principle, WIRELESSPT's wireless charging system can maintain the system output power and efficiency basically unchanged within the range of X, Y, and Z axis offsets. The product supports a maximum charging current of 200A, and the system's maximum transmission efficiency can reach 93%. The integrated design combines the power converter and the coupling coil into one, reducing the volume by approximately 60%. The IP65/IP67 protection level ensures the reliable operation of the equipment in dusty and humid environments.

It is particularly important to note that the humanoid robot category is diverse and various, and different models have significant differences in charging power, receiving end size, installation position (foot, back, or torso), and other requirements. WIRELESSPT currently provides a standardized industrial wireless charging product matrix, but for specific humanoid robot models, the technical team needs to conduct scheme assessment and adaptation customization based on the robot's battery parameters, mechanical structure, and working scenarios.

When humanoid robots move from "showcasing skills" to "performing tasks", charging is no longer an option but a key infrastructure that determines whether the robot can truly become a productive tool. WIRELESSPT's wireless charging technology accumulation is providing practical technical support for the energy replenishment needs of this emerging industry.