Top 5 Humanoid Robots Compared by Energy Use: Battery, Runtime and Power (2026)

Tesla's Optimus has the lowest power draw per kilogram of the five, about 5 W for each kilogram of its 57 kg body. Tesla has said its 2.3 kWh, 52 V pack is sized for a full day of work, which works out to roughly 288 W on average over eight hours. Tesla designs its own actuators and battery electronics, drawing on its car business. If that efficiency holds in daily use, Optimus would need the fewest charging breaks of any robot here.

Figure 02 is Figure AI's second-generation humanoid, unveiled on August 6, 2024. Its 2.25 kWh battery sits in the torso and gives about five hours of continuous active operation, an average draw near 450 W, or 6.4 W per kilogram of its 70 kg frame. It carries 20 kg, has 44 degrees of freedom and five-fingered hands with 16 degrees of freedom, and runs a vision-language model on dual GPU modules. Figure retired it in November 2025 after an 11-month deployment at BMW's Spartanburg plant, so its numbers remain a useful benchmark for factory duty.

Figure 03 draws about 460 W on average: a 2.3 kWh battery spread across roughly five hours of use. That works out to 7.5 W per kilogram of its 61 kg body, more per kilogram than Figure 02, although the newer robot is lighter overall. Some of that power feeds features its predecessor lacked, such as palm cameras, tactile fingertips and a faster vision system. It also charges wirelessly through coils in its feet, which removes the need for a person to plug it in between runs.

1X's NEO uses the least total power of the five, about 210 W on average: an 842 Wh battery divided by a four-hour runtime. At 7 W per kilogram of its roughly 30 kg body, it sits in the middle of the group. Low power use is a design choice for a household robot, since a smaller battery keeps the body light and quiet. NEO still has 75 degrees of freedom and a 70 kg deadlift, so the modest draw does not mean a weak machine. Pre-orders opened in October 2025.

Apptronik's Apollo draws the most power of the five: its roughly 2.5 kWh hot-swappable battery lasts about four hours, an average near 625 W, or 8.6 W per kilogram of its 72.6 kg body. The trade-off is a different kind of endurance, because operators can swap a pack instead of waiting for a recharge. Its higher draw goes with a heavier frame and a 25 kg payload, so it works harder than the lighter robots here. Apptronik raised $520 million in February 2026 to scale up production.