UBTECH's Walker S2: The Battery-Swapping Humanoid That Made 24/7 Factory Shifts Practical
UBTECH began mass production of the Walker S2 in November 2025 with orders above 800 million yuan. Its signature feature — a three-minute autonomous battery swap — attacks the least glamorous bottleneck in humanoid deployment: charging downtime.
Every humanoid robot shares an unglamorous constraint: batteries run out, and charging takes hours. UBTECH Robotics' answer, unveiled in July 2025 with the Walker S2, borrows an idea from the electric car industry it supplies — let the robot swap its own battery. The Walker S2 is the first humanoid capable of autonomous hot-swapping: it walks to a swap station, exchanges its depleted pack for a charged one in about three minutes, and returns to work without shutting down or human assistance.
Why battery swap matters more than another demo
A humanoid that must dock for two hours of charging cannot run a night shift, and factories buy shifts, not robots. UBTECH's plug-and-play swap system directly targets the utilization math that decides whether a humanoid deployment pencils out. The company frames the Walker S2 as the foundation for round-the-clock operation — a claim its automotive customers, already familiar with battery-swap economics from Nio's swap stations, are well positioned to evaluate.
The Walker S2 carries 52 degrees of freedom and runs UBTECH's BrainNet platform and Co-Agent system for task planning and multi-robot coordination. It builds on the deployment record of the Walker S1, which spent 2024 and 2025 in training and pilot programs across Chinese car plants.
UBTECH has kept the iteration cadence public. At the 2025 World Robot Conference in Beijing, weeks after the Walker S2 announcement, the company showed five humanoid models spanning industrial, commercial, and research roles — including the wheeled Cruzr S2 and the Walker S1 already deployed in factories — alongside the record commercial contract announcements that have become its signature.
From pilots to purchase orders
UBTECH began mass production and deliveries of the Walker S2 in November 2025, targeting 500 units by the end of that year, with planned capacity of 5,000 units in 2026 and 10,000 in 2027. Cumulative orders for the Walker series passed 800 million yuan (about $112 million), including a single 250-million-yuan purchase — the largest disclosed humanoid order in the industry at the time.
The customer list reads like a cross-section of Chinese manufacturing: BYD, Geely, Audi FAW, and Dongfeng Liuzhou Motor among automakers — Nio and Zeekr had earlier tested UBTECH humanoids on their lines — plus Foxconn and SF Express in electronics and logistics. Deployments concentrate on inspection, material handling, and assembly-adjacent tasks.
The listed pure play
UBTECH trades on the Hong Kong Stock Exchange under ticker 9880, making it the first publicly listed humanoid robot maker — a status it held alone until the current wave of IPO filings from Unitree and others. That listing means its order figures are disclosed under public-company reporting standards, a level of accountability private competitors do not face.
The honest caveats remain: order value is not recognized revenue, factory deployments are heavily concentrated in China, and per-unit economics are not disclosed. But the Walker S2 program demonstrates the industry's central transition in 2025-2026 — from demonstrating what humanoids might do to invoicing what they actually do.
Frequently asked questions
How does the Walker S2's battery swap work?
The Walker S2 autonomously walks to a swap station and exchanges its depleted battery pack for a charged one in about three minutes, without shutting down and without human assistance. UBTECH unveiled the system in July 2025 as the first of its kind on a humanoid robot.
Which companies use UBTECH Walker robots?
UBTECH names BYD, Geely, Audi FAW, and Dongfeng Liuzhou Motor as automotive partners, with Foxconn and SF Express in electronics and logistics. Nio and Zeekr previously tested UBTECH humanoids on their production lines.
Can you buy a Walker S2?
The Walker S2 is an industrial product sold to business customers rather than consumers, and UBTECH does not publish a consumer price. The company began mass production in November 2025 and reports Walker series orders above 800 million yuan.
Sources
CnEVPost — UBTech shows how its humanoid robot can work 24/7 with autonomous battery swap
China Daily — Meet Walker S2, the robot that changes its own batteries
Remix Reality — UBTECH kicks off Walker S2 robot production, targeting 500 units in 2025
TMTPost — UBTECH unveils five humanoid robots at World Robot Conference