UBTECH Walker S2 Specifications

Last updated: 2026-08-26

Physical
Height	1.76 m (launch materials)
Weight	Not officially published. Figures of 73–76 kg in circulation appear to conflate the S2 with the Walker S1 or are otherwise unsourced
Degrees of freedom	52 (confirmed in the FY2025 annual report)
Payload	15 kg (official specification)
Hands	Fourth-generation dexterous hands; manufacturer claims roughly 80,000-cycle durability

Power
Configuration	Dual-battery arrangement
Swap mechanism	The robot walks to a swap station, removes the depleted pack from its own back and inserts a fresh one in about three minutes, remaining powered throughout
Runtime	Not published. Widely quoted “2 h walking / 4 h standing” figures have no official source and may derive from the Walker C

Sensing & computing
Vision	Pure RGB binocular stereo — no lidar in the head (official)
AI stack	Marketed under UBTECH’s “BrainNet 2.0” architecture; the detailed stack is not publicly specified
Walking speed	Not officially disclosed

Commercial
List price	None published
Filings-derived proxy	About ¥760,000 (roughly US$106,000) of products-and-services revenue per unit sold in 2025 — an average, not a price
2025 orders	Approximately ¥1.4bn (about $200m) cumulative, including a ¥264m border-security contract
Availability	Enterprise sales

How it compares

	UBTECH Walker S2	Tesla Optimus	AgiBot A2
Height	1.76 m	1.73 m (Gen 2)	169 cm
Degrees of freedom	52	28+ body (Gen 2)	40+ active
Battery handling	Robot swaps its own pack	Not demonstrated	Swappable, changed by a person
Status (Aug 2026)	Shipping in volume	Pre-production	A2 Lite on sale
Public price	None	None	A2 Lite US$44,560

Specification Sources

RoboZaps — UBTech Walker S2 price and specs — primary source for the 52 DoF figure from the FY2025 annual report, the 15 kg payload, the battery-swap description, and for identifying which circulating figures are unverified
UBTECH Robotics — manufacturer material for height and the BrainNet 2.0 designation

Please note: Robot specifications, capabilities, and availability change frequently as manufacturers release new versions and updates. Information shown reflects publicly available data at time of writing and may not represent the latest version. Figures attributed to the manufacturer have not been independently verified. Always check the manufacturer's official site for current details.