Endurance has always been a bottleneck that cannot be bypassed in the scaled deployment of humanoid robots. Batteries are not merely energy storage components; they directly determine the robot's effective working hours, operational efficiency, and total cost of ownership.
According to the latest forecast by IDTechEx (a UK-based independent research firm specializing in emerging technologies such as batteries, robotics, and advanced materials), the humanoid robot battery market is expected to reach $850 million by 2037, with a compound annual growth rate (CAGR) of 34.2% over the next decade. The demand for backup batteries driven by battery-swapping models will further expand the market potential.
Unlike consumer electronics or power batteries, humanoid robot batteries must simultaneously balance energy density, discharge power, safety performance, and cycle life, while also meeting cost requirements for mass production. In its report, IDTechEx conducted a key comparison of three mainstream technical routes: lithium-ion batteries, solid-state batteries, and lithium-sulfur batteries.
New electrochemical systems show considerable potential, but at this stage, they generally suffer from high costs and significant challenges in mass production. Precisely because the technology has not yet converged, the industry has diverged into three distinct commercial solutions: fast charging, solid-state long-endurance, and battery swapping. Manufacturers such as Agility and XPeng have already introduced corresponding engineering solutions.
1. Agility Bets on Short-Duration Fast Charging: 9-Minute Recharge, Targeting 20 Hours of Daily Operation
Agility equipped the Digit 5 with a Nyobolt fast-charging battery solution, making it a representative player in the fast-charging route. According to official parameters, the robot can operate continuously for 90 minutes and requires only 9 minutes to recharge. The manufacturer's vision is to rely on high-frequency rapid charging to extend the robot's effective daily working time to over 20 hours. This solution is planned to begin early pilots in the first half of 2027.
The advantage of the fast-charging route is that it does not require stockpiling large numbers of spare battery packs, thereby reducing capital investment. However, its shortcomings are equally obvious: frequent charging interrupts workflow. Whether this model can deliver productivity depends on real-world factors such as the time required for the robot to autonomously return to charge, maintenance faults, and delays caused by task interruptions. Currently, detailed quantitative data such as battery capacity, charging power, and cycle life have not been publicly disclosed, and long-term reliability remains to be verified.
2. XPeng Advances Small-Batch Prototyping of Solid-State Batteries for Humanoids, Focusing on Safety and High Energy Density
Different from Agility's fast-charging approach, XPeng chose the solid-state battery route. Solid-state batteries for the IRON humanoid robot have entered the small-batch production phase. XPeng highlights two core advantages of solid-state batteries externally: higher energy density and superior safety performance, which can inhibit thermal runaway propagation and offer impact resistance and puncture tolerance.
However, there remain disagreements within the industry: while the external marketing claims refer to "all-solid-state," previous reports suggested the solution might be semi-solid-state. At present, the official channel has not released clear performance metrics. Key information such as actual range, weight, and cost remains undisclosed, and real-world implementation results await continuous tracking.
3. Battery Swapping Model Shows Potential: Battery Demand Will Exceed Number of Robot Units
Beyond the iteration of battery materials themselves, battery swapping is a widely accepted solution in industrial scenarios. When a robot's battery is depleted, it directly swaps for a fully charged pack to quickly return to duty, while the discharged batteries undergo centralized offline charging.
This model brings about a key change: the market demand for batteries will exceed the shipment volume of robot units. Operators need to stockpile a certain number of backup batteries to ensure continuous production line operation, which is the core reason why IDTechEx included backup pack demand in its market calculations.
4. Industry Consensus: Focus on "Effective Working Hours"
Whether it is long-endurance solid-state, ultra-fast charging, or automatic battery swapping, the ultimate evaluation criterion is not the nominal range figure, but the effective working hours.
For B-side operators in factories and warehouses, the core metric is the stable task volume a single robot can complete within one shift, alongside full-cycle costs including charging piles, backup batteries, future battery replacements, and maintenance. Each of the three routes involves trade-offs, and no single solution fits all scenarios.
IDTechEx's calculation outlines the growth expectations for the battery sector, a core component track for humanoid robots. As whole-machine deployments accelerate, competition among battery solutions will continue to influence the pace of humanoid robot commercialization.
Batteries are currently one of the components where the conflict between cost and performance is most concentrated in humanoid robots. Fast charging, solid-state, and battery swapping essentially represent trade-offs among recharging speed, endurance ceiling, and capital investment. Which route do you favor? Feel free to leave a comment below.