BYD developed sodium-ion batteries with 10,000 cycle life.

Mass production timing depends on market demand.

CATL launched Naxtra sodium-ion batteries in April 2025.

The first vehicles equipped with them arrive mid-2026.

Most see technical parity.

What actually happens: market position determines deployment speed.

BYD achieved the same 10,000 cycles CATL targets.

But BYD waits for demand signals before committing production.

(But BYD has built a 30 GWh sodium-ion battery plant).

CATL already locked supply agreements and vehicle launches.

BYD built full vertical integration for LFP: lithium mining to cell production internally controlled.

This drives significant cost advantages in current chemistry.

Adding sodium-ion means building a parallel supply chain infrastructure.

CATL supplies external customers with a portfolio approach.

Adding chemistry serves existing customer relationships.

Vertical integration reduces costs but creates switching friction.

External supply enables flexibility but depends on supplier margins.

Technical capability and commercialization timing are different decisions.

Supply chain architecture determines the economic threshold for deployment.