Digit 5 Targets 20-Hour Workdays With Nine-Minute Charging

Nine minutes of charging for 90 minutes of work is the operating cycle Agility Robotics has set for Digit 5. The company has selected Nyobolt battery technology for the humanoid robot, targeting more than 20 productive hours within a 24-hour day. That could take the machine through more than two full shifts, although the figures remain design targets rather than results from deployed Digit 5 robots.

The numbers produce a planned 10:1 run to charge ratio: 10 minutes operating for every minute connected to a charger. Agility contrasts that with a 2:1 ratio for Digit 4. Early-access Digit 5 units using the new battery system are expected to reach manufacturing, warehouse and distribution operators in the first half of 2027, leaving the central performance claim untested in customer operations for now.

Charging time determines usable capacity

For industrial robots, nominal runtime tells only part of the story. A machine that spends long periods charging may require additional robots to maintain task coverage, while frequent handoffs can complicate fleet scheduling. Agility Chief Business Officer Daniel Diez put the commercial issue directly: “For our customers, Digit’s uptime is the business case.”

If Digit 5 repeatedly delivers 90-minute runs separated by nine-minute charges, its battery interruptions would occupy a much smaller fraction of the working day than Digit 4’s stated ratio suggests. The intended result is higher utilization from each robot rather than merely a longer single discharge. In a fleet, that could mean more task time from the same number of machines and fewer idle units waiting for energy.

The cycle also reflects a design choice. Instead of carrying enough battery capacity for an uninterrupted shift, Digit 5 is intended to recover energy during short, scheduled pauses. That approach can limit pack size and weight, both important on a walking robot whose actuators must repeatedly accelerate and support its own mass. Agility and Nyobolt aim to obtain more power from a smaller, lighter pack while retaining the reliability required in industrial environments.

Nyobolt attributes its rapid-charging approach to low-impedance cells, anode materials, power electronics and software controls. A separate Nyobolt vehicle demonstrator charged from 10% to 80% in four minutes and 37 seconds, according to a University of Cambridge account. Independent testing cited there recorded more than 4,000 fast-charge cycles while retaining over 80% capacity. Those results show relevant progress in charging speed and cycle life, but a sports-car prototype does not reproduce a humanoid robot’s pack configuration, duty cycle or warehouse workload.

The daily target depends on more than the battery

A 10:1 energy ratio does not by itself guarantee 20 productive hours. The robot must also reach a charger when required, connect reliably, remain thermally controlled and return to its assigned task without lengthy delays. Task intensity matters as well: walking, lifting and repeated acceleration can impose different power demands from standing or handling lighter objects. Agility’s daily figure will therefore depend on the complete system sensing, motion control, actuation, charging infrastructure and fleet orchestration not the cells alone.

Deployment alongside people adds another boundary. Workplace automation at this utilization level will make questions about whether robots replace workers more tangible, but battery uptime cannot answer that question. Task allocation, safety controls, economics and the ability to handle variable work will determine how the machines are used. The National Institute for Occupational Safety and Health notes that growing robot use can support production and potentially reduce injuries while also introducing new risks. Its robotics research includes how machine size, movement paths and alerts affect worker comfort and task performance.

The first half of 2027 is consequently more than an availability date. Early-access machines will provide the first opportunity for operators to examine whether nine-minute charging and 90-minute runs remain repeatable amid real task variation, charging queues and industrial schedules. Until those robots arrive, Digit 5’s leap from Digit 4’s 2:1 ratio to 10:1 and the promised workday of more than 20 hours remains an ambitious engineering target awaiting operating evidence.

By Jonathan Barrett — Editor for AMI’s future mobility and autonomous systems section, with two decades covering robotics, e-mobility, drone-vehicle convergence, and transport mechanical systems.