Korean Battery Giants Eye Robotics as Optimus and Atlas Scale Up

The Robot Battery Race Is Now Real

For years, the humanoid robot market existed mostly in demo videos and investor decks. That era is ending. Tesla's Optimus program and Hyundai's Atlas platform have accelerated development timelines to the point where battery suppliers — the same companies that built South Korea into an EV powerhouse — are now treating robotics as a genuine next revenue pillar, not a speculative side project.

According to reporting by TheElec, LG Energy Solution, SK On, and Samsung SDI are each formulating strategies to compete for robot battery contracts. The timing is not accidental. Elon Musk has indicated that meaningful Optimus production is targeted around the end of 2026, with a slow ramp expected before volumes climb. That production horizon gives suppliers roughly 12-18 months to qualify their cells and secure design wins — a tight window by battery industry standards.

Why Robot Batteries Are a Different Problem

It would be a mistake to assume that building batteries for humanoid robots is simply a smaller version of building EV packs. The requirements diverge in several important ways:

• Energy density: A robot operating untethered for a full shift needs maximum energy packed into minimum volume and weight. Every gram matters when it sits in a moving torso.
• Discharge rate: Robotic actuators — particularly in the legs and hands — demand sudden high-current bursts during dynamic movements. EV cells are optimized for sustained, relatively predictable loads.
• Safety profile: A robot working alongside humans in a factory or home environment cannot tolerate thermal runaway events. Safety requirements are arguably stricter than automotive, not looser.
• Form factor flexibility: Unlike a skateboard EV platform with a flat floor, humanoid robots require cells that can conform to irregular body cavities — torso, hip, and limb segments.

These constraints mean Korean battery makers cannot simply redirect existing EV cell lines toward the robot market. New cell chemistries, form factors, and battery management architectures are required — which is precisely why this is being treated as a strategic initiative rather than a product extension.

The Hyundai-Tesla Dynamic

The two humanoid programs driving this supplier scramble could not be more different in their origins. Hyundai acquired Boston Dynamics in 2021 and has since pushed Atlas toward industrial deployment, with a clear path to integrating SK On cells given the existing automotive relationship between the two Korean giants. Tesla, by contrast, is building Optimus entirely in-house — designing its own actuators, AI inference chips, and battery architecture under one roof.

That vertical integration philosophy means Tesla may not simply hand a robot battery contract to an outside supplier the way a traditional automaker would. Tesla has historically brought critical components in-house when it believes doing so yields a competitive advantage — the 4680 cell program being the clearest example. Whether Optimus ultimately runs on Tesla-designed cells, sourced cells, or a hybrid approach remains an open question. But the fact that Korean suppliers are actively preparing for this market suggests they believe there is a real procurement opportunity — and they may be right, at least for early production volumes before any in-house ramp matures.

🔭 The BASENOR Take

📰 Deep Dive

The strategic logic for LG Energy Solution, SK On, and Samsung SDI is straightforward: the EV battery market, while still growing, is becoming intensely price-competitive — particularly as Chinese manufacturers like CATL and BYD's battery division continue to drive down costs. Robotics offers a premium-margin escape valve. Robot batteries, at least in the near term, will not be commoditized the way EV cells eventually will be. The performance and safety requirements are stringent enough that brand reputation and engineering capability matter more than raw cost per kilowatt-hour.

For Tesla specifically, the Optimus program represents one of the most consequential bets in the company's history. Musk has described a future where Optimus robots could eventually outnumber Tesla vehicles in terms of units produced — a claim that sounds audacious today but is grounded in the observation that the addressable market for general-purpose labor automation is orders of magnitude larger than the passenger vehicle market. If even a fraction of that vision materializes, the battery supply chain implications are enormous.

What is worth watching closely is whether Tesla's 4680 cell architecture — designed for vehicles but featuring the structural and energy-density properties that could translate to robotics — gets adapted for Optimus. Tesla has the manufacturing infrastructure and the in-house chemistry team to pursue that path. If it does, Korean suppliers may find themselves competing for a smaller slice of the Optimus pie than they are currently modeling. The smarter play for LG, SK On, and Samsung SDI may be to target the broader humanoid robot ecosystem — the dozens of other companies building robots that lack Tesla's vertical integration — rather than betting exclusively on winning a Tesla contract.

Either way, the race is on. The fact that South Korea's battery establishment is mobilizing at this scale and speed is itself the most important data point. It confirms that the humanoid robot market has crossed from hype into genuine industrial planning — and that the supply chain competition for this new category is already underway. For Tesla owners tracking the Optimus program, this is a meaningful signal that the hardware ecosystem needed to support serious production volumes is beginning to take shape.