KAIST Four-Legged Robot Completes Marathon on Single Battery Charge
A four-legged robot developed by a team at KAIST has completed a full marathon on a single battery charge. The robot ran the Sangju Marathon in South Korea in 4 hours and 19 minutes, finishing alongside human runners. The team says the machine traveled three times as far per charge as existing legged robots.
The demonstration marks a notable advance in energy efficiency for dynamic legged locomotion. Completing a marathon requires sustained balance, propulsion, and control over 42.195 kilometers. For a legged robot, maintaining those functions without recharging is a major engineering challenge.
KAIST researchers attribute the improved range to advances in actuator design, gait control, and power management. While technical details remain limited, the result suggests that legged robots can operate for much longer periods than previously demonstrated.
Longer endurance could expand the practical use of legged robots in logistics, inspection, and disaster response. Reduced charging frequency allows such machines to cover larger areas and perform longer missions in the field.
The team says the technology could pave the way for improved battery life in legged robots more broadly. Future tests may examine performance on different terrains, with heavier payloads, or under varying weather conditions.
The marathon run also highlights the growing competitiveness of legged robots against wheeled and tracked platforms for certain outdoor tasks. Yet challenges remain in cost, durability, and real-world deployment.
KAIST's demonstration is a milestone, but it is not yet clear when such robots will be commercially available. The team continues to refine the system with an eye toward practical applications.
The Sangju Marathon provides a public stage for testing endurance beyond laboratory conditions. Running alongside humans adds a compelling visual and symbolic dimension to the achievement. If the robot can sustain similar performance in everyday environments, it could help redefine the role of legged machines in industry and services.