Why Panasonic’s 4680 battery ramp is waiting on approval—and why data centers are gaining

What changed in the latest 4680 delay

Panasonic has delayed 4680 production before, but the reason has shifted. In 2023, Reuters reported that Panasonic postponed commercial production to the April-to-September 2024 period so it could introduce performance-improvement measures for the cells ^[1]. The latest reported delay is different: in May 2026, Just Auto, summarizing Nikkei Asia, said Panasonic Energy had pushed back mass production because a confirmed purchase order from a key customer had not arrived ^[2].

That distinction matters. A performance delay implies the product or process needs further refinement. A missing order or approval delay means the factory can be technically prepared while the business case for high-volume output is still unsettled. The provided sources do not identify the exact technical, pricing, timing, or volume condition still blocking the order, so it would be premature to call this a specific cell-performance failure.

Why Wakayama can be ready but not ramped

Panasonic’s Wakayama plant is central to the 4680 rollout. Reuters-syndicated coverage reported that Panasonic Energy finalized preparations for mass production at its renovated Wakayama plant, which was designated as the main factory for the 4680 cells ^[5]. Other coverage at the time said production would start after client approval, with annual capacity planned at several gigawatt-hours ^[10].

That means there are two separate gates. The first is manufacturing readiness: equipment, line preparation, samples and factory staffing. The second is commercial release: customer approval, purchase orders and committed production schedules. The latest no-order report suggests Wakayama is stuck at the second gate rather than lacking a prepared site ^[2][10].

Why Tesla approval matters

Tesla matters because Panasonic is a Tesla battery supplier and Tesla has been one of the main advocates for the 4680 format ^[12]. Panasonic’s 4680 cells are also strategically important because the company says they have about five times the capacity of its smaller 2170 cylindrical cells ^[5].

For Wakayama, approval from a major automaker is not just a formality. Panasonic previously sent sample 4680 cells to automaker customers and was waiting for approval before production began ^[5][10]. If the pending customer decision is Tesla’s, the effect is straightforward: Wakayama can remain in a ready-or-sample stage, but it cannot move into predictable mass output without the order that defines volume, schedule and economics. The available sources support the key-customer order gap ^[2], but they do not disclose the exact Tesla approval criteria.

Why Panasonic is shifting attention to data-center energy storage

The pivot toward data-center storage is about demand quality. Panasonic Energy’s 2025 integrated report said that, amid slower EV-market growth, its overall in-vehicle business decreased 20% year on year to 481.2 billion yen, despite strong demand for battery cells produced in North America ^[17]. The Star later reported that Panasonic Energy’s profit declined 42% in the past financial year as falling in-vehicle battery earnings outweighed gains in industrial and consumer storage ^[20].

Data centers are pulling in the opposite direction. Panasonic’s 2024 integrated report said sales of storage battery systems for data centers were strong because of the expansion of the generative AI market, and that the company had started mass production of power-supply systems for data centers ^[27]. Panasonic also said it was making battery cells for data-center applications in response to strong demand at plants in the U.S. and Japan ^[20]. Nikkei coverage relayed by Tiger Brokers described Panasonic supplying rack-mounted storage systems that support data-center operations during outages and peak usage ^[19].

In plain terms, batteries that might otherwise be tied up waiting for EV demand, approvals or model timing can be redeployed into storage systems where customers need backup power and energy-management capacity for AI infrastructure.

The broader battery-market signal

Panasonic’s move fits a wider pattern. S&P Global describes automakers and battery suppliers scaling back or rebalancing EV ambitions and redirecting excess battery capacity toward faster-growing energy-storage markets amid policy and demand shifts ^[18]. That does not mean Panasonic is abandoning EV batteries: the company still prepared Wakayama for 4680 production and continues to report strong North American battery demand ^[5][17]. It does mean the company has a practical reason to avoid waiting on one EV ramp when data-center storage demand is available now.

What to watch next

The key signal is a confirmed customer approval or purchase order for Wakayama 4680 cells. Without that, Panasonic can say the line is prepared, but investors and customers still lack proof of a full commercial ramp ^[2][10]. The second signal is capacity allocation: if Panasonic continues converting or prioritizing battery output for data-center storage, it would show that AI infrastructure is not just a side market but a meaningful competitor for battery-manufacturing capacity ^[19][20].

For Tesla, the implication is simple but important: an external Panasonic 4680 supply ramp from Wakayama remains conditional. For Panasonic, the strategy is more flexible—keep the 4680 option alive, but use data-center storage to absorb battery capacity while EV demand and customer approvals move more slowly.

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