Tesla’s Battery Day is only a few days away, and as the event draws closer, it appears that the electric car maker is starting to make its “Roadrunner” site as presentable as possible to its visitors. As could be seen in a recent drone flyover of the pilot battery cell production site, the surroundings of the Kato Road building are now being cleared of materials and equipment, likely in preparation for Battery Day.
The Kato Road facility holds one of the most highly-anticipated segments of the upcoming Battery Day event. During the event, Tesla is expected to discuss the work that it has been doing with its battery tech over the years. Much of these developments have been heavily speculated, with reports indicating that Tesla will be discussing the development and capabilities of its next-generation cells, which could last a million miles on the road or decades if used as energy storage units.
But beyond these discussions, Battery Day will also involve a tour of Tesla’s “Roadrunner” site, which is located in Kato Road, close to the Fremont factory. The full details of the “Roadrunner” site have not been discussed by Tesla so far, though reports and filings about the site have suggested that the location holds the pilot production line for the electric car maker’s own custom-designed cells.
Interestingly enough, a recent leak reported in EV publication Electrek hinted at what the “Roadrunner” battery cells could possibly look like. Images leaked to the publication featured a rather hefty cell that is far larger than the 18650 and 2170 batteries being used by Tesla in its existing electric vehicle lineup. Observations and basic analyses from Tesla community members with a background in battery technology have pointed to the “Roadrunner” cell potentially adopting a 54×98 form factor.
If these speculations are accurate, Tesla may be going for complete EV domination with its next-generation batteries. Battery cells that adopt the 54×98 form factor hold about 10 times the volume of a 2170 cell, and according to Jordan Giesige of The Limiting Factor channel on YouTube, this presents several advantages for the electric car maker. With the larger cells, for example, Tesla could equip its vehicles with an order of magnitude fewer cells than before, resulting in massive savings in production costs.
These speculations will likely be proven or debunked this coming Battery Day, which is scheduled for this coming Tuesday, September 22, 2020. Regardless of this, however, the Kato Road facility is poised to get even busier in the near future. As noted in filings to the City of Fremont, the “Roadrunner” site will be housing 45 research and development employees and up to 425 manufacturing workers that are spread through several shifts from Monday to Friday. This should make the “Roadrunner” facility humming along nicely, and perhaps even producing enough cells for low-volume vehicles like the Plaid Model S, Plaid Model X, and the next-generation Roadster.
Watch a recent flyover of the “Roadrunner” facility courtesy of Tesla community member Gabeincal in the video below.
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Tesla FSD earns high praise in South Korea’s real-world autonomous driving test
As per the Korea Expressway Corporation’s report, the FSD test was conducted on December 15, 2025, from 10 a.m. to 6 p.m.
Tesla’s Full Self-Driving (FSD) has received a bullish assessment from the Korea Expressway Corporation following a real-world autonomous highway driving test.
A report of the test, shared on Naver Cafe, showed high praise for the system’s safety, capabilities, smooth maneuvers, and confidence.
South Korean highway test
As per the Korea Expressway Corporation’s report, the FSD test was conducted on December 15, 2025, from 10 a.m. to 6 p.m. Four people were in the Tesla that was tested, including the head of the mobility department. All four FSD driving modes were tested, from “Sloth” to “Mad Max.”
To test FSD’s performance, the system was tasked to operate on highways such as Gyeongbu, Cheonan, and Cheonan-Nonsan, as well as city areas in Dongtan New Town, Sejong Special City, and Daejeon Metropolitan City, among others.
Since FSD is only available for the Tesla Model S and Model X that are imported to South Korea from the United States, the system was not tested in a Model 3 or Model Y, which comprise the majority of Teslas on the country’s roads today.
Highway test results
Results showed FSD performing well, both in inner-city roads and on highways. In inner city roads, the testers noted that FSD was capable of autonomous driving at a level that already exceeds that of general human drivers, except in very few areas, such as unprotected left turns and work zone intersections.
In highways, the testers described FSD’s performance as “excellent,” though the system still showed frequent cases of violations in local bus lanes and max speed limit rules. These, however, could hopefully be addressed by Tesla in a future FSD update without many issues. The testers also noted that in some parts of the test, FSD seemed to be driving autonomously in accordance with traffic flow rather than strict traffic rules.
테슬라 Fsd 고속도로 자율주행 테스트 결과 보고 by Simon Alvarez
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Tesla claims nearly 20% market share as Norway sets new car sales record
Tesla captured roughly one in five new cars in Norway, highlighting its dominance in the world’s most EV-friendly market.
Norway shattered its all-time new car sales record in 2025, and Tesla emerged as the clear winner. A year-end rush ahead of higher EV taxes pushed registrations to nearly 180,000 vehicles, with electric cars accounting for 96% of sales.
Tesla captured roughly one in five new cars in Norway, highlighting its dominance in the world’s most EV-friendly market.
Norway’s EV rush
As noted in a CarUp report, Norway’s electric vehicle sales in 2025 surged, thanks in part to buyers rushing ahead of a post–new year VAT increase of roughly 50,000 kronor on many new electric cars. This ended up pulling demand forward and setting a national record with almost 180,000 registrations in 2025.
The result was unprecedented. From the vehicles that were sold in 2025, 96% of new cars sold were fully electric. And from this number, Tesla and its Model Y made their dominance felt. This was highlighted by Geir Inge Stokke, director of OFV, who noted that Tesla was able to achieve its stellar results despite its small vehicle lineup.
“Taking almost 20% market share during a year with record-high new car sales is remarkable in itself. When a brand also achieves such volumes with so few models, it says a lot about both demand and Tesla’s impact on the Norwegian market,” Stokke stated.
Tesla domination
Tesla led all brands in Norway with 34,285 registrations, which is equal to a 19.1% market share. These results place Tesla well ahead of Volkswagen and Volvo, which held a 13.3% and 7.8% market share in 2025, respectively.
On the model chart, Tesla’s strength was even clearer. The Tesla Model Y topped all vehicles with 27,621 registrations, accounting for 15.4% of the entire market. The Tesla Model 3 also ranked among the top five, accounting for 3.7% of Norway’s entire auto sales in 2025.
Other strong performers included Volkswagen’s ID.4 and ID.7, Toyota’s bZ4X, which commanded 4.9%, 3.9%, and 4.1% of Norway’s total sales in 2025, respectively.
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Tesla China sees 2nd-best month ever by selling 97,171 vehicles wholesale in December
The results mark Tesla China’s second-highest monthly result on record, trailing only November 2022’s 100,291 units.
Tesla posted a sharp year-end rebound in China last month, with December’s wholesale figures climbing to their second-highest level to date.
The surge capped a late-year recovery for the electric vehicle maker, even as full-year wholesale figures still finished lower year over year. Still, the data highlights how Tesla China’s offerings still resonate with customers in the world’s most competitive electric vehicle market.
Tesla China’s December surge
Tesla China sold 97,171 vehicles wholesale in December, as per data from the China Passenger Car Association (CPCA). The results mark Tesla China’s second-highest monthly result on record, trailing only November 2022’s 100,291 units, based on data compiled by CNEVPost. The details of Tesla China’s December results, such as its domestic sales and exports, are yet to be released.
December’s wholesale results represent a 3.63% increase from the same month last year and a 12.08% jump from November’s 86,700 units. It also marked the second consecutive month of year-over-year growth, signaling renewed momentum in China.
Tesla’s late-year momentum is believed to be partly driven by Tesla pulling deliveries forward to allow buyers to take advantage of more favorable purchase tax policies before the calendar year ended. That strategy helped boost monthly performance even as competition in China’s EV market remained intense.
Tesla China’s FY 2025 volumes
Despite the strong December finish, Tesla China’s wholesale sales declined on an annual basis. The electric vehicle maker’s total wholesale figures for 2025 reached 851,732 units, down 7.08% year over year. This could have been due to a variety of factors, from intense competition in the domestic Chinese market to Giga Shanghai’s changeover to the new Model Y in the early part of the year.
Tesla Gigafactory Shanghai continues to play a central role in its global operations, producing the Model 3 sedan and Model Y crossover for both Chinese customers and export markets. The efficiency of Gigafactory Shanghai has allowed it to become Tesla’s largest factory by volume, as well as the company’s primary vehicle export hub.
Tesla FSD earns high praise in South Korea’s real-world autonomous driving test
Tesla claims nearly 20% market share as Norway sets new car sales record
