Hyundai finalizes Atlas battery specs, with Samsung SDI set to supply most early packs

Each Atlas will carry 70 Samsung SDI 2170 cells in a roughly 1.3 kWh pack, as Hyundai locks down its supply chain for 2028 production.

Hyundai Motor has finalized the battery specifications for Atlas, the humanoid robot built by its Boston Dynamics subsidiary, and selected Samsung SDI and LG Energy Solution as suppliers. Samsung SDI is expected to handle most of the initial volume and remain the sole supplier for now, given limited production volumes.

Each Atlas will use 70 cylindrical 2170 cells, each 21 millimeters in diameter and 70 millimeters tall, with a capacity of 5,000 milliamp-hours. Assembled into a pack, they provide about 1.3 kilowatt-hours. Hyundai has assigned responsibility for Atlas to its automotive components subsidiary Hyundai Mobis. Samsung SDI works with Valeo Kapec on the battery packs, while LG Energy Solution partners with Powerlogics.

The battery decision follows Boston Dynamics' move in late October to tell South Korean suppliers to prepare to produce components for 10,000 Atlas units by the end of next year. Hyundai Mobis will make the joint actuators and hand grippers, Samsung SDI and LG Energy Solution will supply the batteries, BH EVS will handle charging and CTR will produce control arms. Mass production of Atlas is scheduled for 2028 or later, and the Spot quadruped, which uses the same 2170 cells, will be tested first.

The cell choice builds on an existing relationship: Samsung SDI already supplies 21700 cells for Hyundai's DAL-e service robot and MobED mobile platform, and the two companies agreed in February 2025 to jointly develop high-performance batteries built for robots. The pack is the part of a humanoid that sets how long it can work before recharging, so locking down its design is a step toward volume production rather than one more prototype.