Agility Digit 5 Nyobolt Battery Hits 9-Minute Charge for 20-Hour Days

Battery Partnership Targets Warehouse Uptime Limits

Agility Robotics announced on October 15, 2026, that it selected Nyobolt to supply the fast-charging battery system for Digit 5. The partnership directly addresses runtime constraints that limited earlier Digit models in continuous warehouse shifts. Nyobolt’s high-power lithium-ion technology, built around proprietary anode materials and integrated power electronics, enables the claimed 90-minute runtime followed by a nine-minute recharge cycle. This produces a 10:1 run-to-charge ratio, a marked improvement over the 2:1 ratio reported for Digit 4. Agility states the new capability supports more than 20 hours of productive work in a 24-hour period, equivalent to more than two full shifts.

Daniel Diez, Agility’s chief business officer, framed the change explicitly around customer economics: “For our customers, Digit’s uptime is the business case.” The announcement came weeks after Digit 5’s September introduction as a platform engineered for cooperative safety in shared human workspaces. Warehouse operators deploying fleets have long cited charging downtime as a primary barrier to positive ROI, particularly when robots must return to fixed docks on schedule. The Nyobolt integration aims to shrink that non-productive window while keeping the battery pack compact enough to preserve mobility and payload capacity.

Power Density and Pack Design Implications

Nyobolt co-founder and CEO Sai Shivareddy noted that Digit 5 requires greater power delivery from a smaller, lighter pack than previous versions. The company’s cell design and power electronics allow high charge rates without the thermal or cycle-life penalties that typically accompany aggressive fast charging. In warehouse environments, repeated acceleration, lifting of 23 kg bins, and navigation through narrow aisles place continuous demands on the energy system. A heavier battery would increase joint torque requirements and energy consumption per step, creating a negative feedback loop on overall efficiency. By contrast, the targeted pack prioritizes power density to maintain the robot’s dynamic gait characteristics while extending operational windows.

The redesign also incorporates system-wide upgrades for safety certification and regulatory compliance. These changes added mass to earlier prototypes, shifting Digit 5’s appearance and balance characteristics away from the lighter research platforms that preceded it. Battery placement on the torso or back directly influences center-of-mass dynamics during locomotion and manipulation. Engineers must therefore balance energy capacity against the actuator torque margins needed for stable walking and bin handling. Nyobolt’s emphasis on reduced system weight helps mitigate some of these trade-offs, though full specifications on pack capacity in kilowatt-hours or peak discharge rates remain undisclosed.

Operational Cycle Economics in Real Deployments

A 99-minute idealized cycle of 90 minutes work plus nine minutes charge yields roughly 14.5 cycles per day and approximately 21.8 hours of runtime before accounting for travel to docks, task queuing, or maintenance. Earlier Digit 4 deployments at GXO Logistics for SPANX tote movement demonstrated commercial viability but highlighted how charging time eroded fleet utilization. With the new ratio, operators could theoretically cover two full shifts with fewer robots or extend coverage without proportional increases in fleet size. Serviceability considerations become more prominent: rapid charging reduces the number of dock stations required per robot, lowering infrastructure costs, yet it increases the frequency of high-current connections that must withstand industrial environments.

Agility has not released measured field data from customer sites, and the 20-hour figure represents arithmetic projection rather than verified uptime. Factors such as bin weight variability, aisle congestion, and occasional human intervention will reduce realized utilization below the theoretical ceiling. Still, the improvement from 2:1 to 10:1 represents a step change in the economics of legged humanoids versus wheeled AMRs that can charge opportunistically during transit. Early access to Digit 5 units with Nyobolt batteries is scheduled for the first half of 2027, with broader availability following over six to nine months.

Safety Features and Proximity Work Constraints

Digit 5’s redesign prioritizes cooperative safety features that allow closer operation alongside human workers. This capability expands potential use cases in existing facilities without requiring full segregation of robot and human zones. Battery thermal management during nine-minute charges must integrate with these safety systems to prevent localized heating that could trigger protective stops or limit cycle rates. The partnership announcement does not detail specific sensor fusion or power electronics safeguards, but Nyobolt’s experience supplying high-reliability packs for demanding mobility applications suggests attention to these integration points.

Torque density at the joints remains critical because the robot must handle 23 kg payloads at height while maintaining balance on two legs. Energy delivery from the battery directly affects peak actuator performance during lifts and recoveries from minor disturbances. A lighter, higher-power-density pack supports sustained operation without derating motors or reducing speed to manage heat. Operators evaluating total cost of ownership will weigh these hardware gains against the need for compatible fast-charging infrastructure and potential impacts on battery cycle life under repeated high-rate charges.

Fleet Scaling and Infrastructure Considerations

Warehouse operators planning multi-robot deployments must model charging station placement and queue management. A robot completing a 90-minute cycle every 99 minutes requires reliable dock access without creating bottlenecks at shift changes.