What is the battery life of Tesla Optimus?

What Tesla has officially said

Tesla has not published an official spec sheet for Optimus that includes battery capacity (kWh), runtime under load, or charging time. The only publicly available figures come from Elon Musk's verbal statements and from observers analyzing the visible battery housing on Gen 2 demonstration units.

The closest thing to a public spec is Musk's general framing that Optimus should operate for a working day before needing a recharge — implying a ~4–8 hour runtime target depending on workload.

Why the precise number isn't public

Battery life on a humanoid robot is not a single number. It varies enormously with:

• Workload. Idle standing draws far less power than continuous walking or dexterous manipulation. A humanoid that lasts eight hours light-duty may last two hours heavy-duty.
• Actuator type. Optimus uses electric actuators with harmonic drives — efficient for static holding but power-hungry under dynamic loads.
• Environmental factors. Cold storage warehouses, hot manufacturing floors, and outdoor environments all affect battery chemistry runtime.
• Charge level cutoffs. Operators typically pull a unit at 20–30% remaining for safety, not at zero.

How it compares to other humanoids

The few humanoid platforms with public field data report similar ranges:

• Agility Robotics Digit: roughly 4 hours of continuous work, then a battery swap or recharge.
• Apptronik Apollo: marketed with a hot-swap battery for continuous operation across multi-shift environments.
• Figure AI 02: Figure has stated approximately 5 hours of runtime under typical workloads.
• Boston Dynamics Atlas (electric): approximately 60–90 minutes under demanding dynamic motion, longer for static tasks.

Optimus would be in line with the cohort if it lands in the 4–8 hour range for light work.

Charging method

Tesla has not publicly shown the Optimus charging interface, charge rate, or whether the battery is hot-swappable. For comparison, Apptronik Apollo and Agility Digit are designed for hot-swap or rapid-swap battery operation — a key operational requirement for multi-shift warehouse deployment.

Bottom line

There is no Tesla-published battery life specification for Optimus in 2026. Working assumption based on Musk statements and analogous platforms: a single working day for light task work, less for heavy dynamic loads. Treat any specific number you see in third-party sources as inference, not Tesla disclosure.