News

Tesla ‘Roadrunner’ cell leak hints that Battery Day will be more insane than expected

Tesla Gigafactory Nevada battery cell production line (Credit: Super Factories)

Published

5 years ago

September 17, 2020

Simon Alvarez

Tesla’s Battery Day has been hyped so much that the event will have to include something truly amazing to live up to its expectations. In the lead up to the highly-anticipated event, a leaked image featuring what is supposedly a cell from Tesla’s “Roadrunner” line has emerged. And if the leak proves legitimate, it would appear that Battery Day will not only meet expectations — it will be even more insane than expected.

The leaked image, which was initially published in a report on Electrek, featured a massive battery cell that was supposedly a product of the Roadrunner line. The publication noted that the image was sent through an anonymous source and confirmed by another independent source. From the get-go, it is evident that the cell is massive, closer in size to a supercapacitor than a traditional battery cell. Initial observations by battery enthusiasts online also point to some radical improvements that such a cell design would bring.

…thus providing the positive connections. There are no individual cells with individual caps. The cover plate is the cap and connection for all cells in the group. The entire thing sits in a bath a dielectric coolant that is pumped through the case.— BRCooper⚡🔋🚀 (@_BRCooper) September 16, 2020

While Electrek’s sources have mentioned that the Roadrunner cell will feature roughly double the diameter of the 2170 cells that the electric car maker currently uses in the Model 3 and Model Y, Tesla enthusiast @_BRCooper, who is familiar with battery tech, has observed that one of the leaked images had the number “054” printed on its side. If this number represents the cell’s diameter, it would point to Tesla’s Roadrunner cells adopting a 54×98 form factor, which has 10x the volume of a 2170 cell.

As noted by Jordan Giesige of The Limiting Factor channel on YouTube, adopting a 54×98 form factor for its next-generation cells has numerous implications for the entire battery manufacturing process and the performance of Tesla’s vehicles as a whole. With the larger cells, Tesla could produce battery packs that have an order of magnitude fewer cells than before. This would result in the company only using 1/10 the number of rolls, cans, electrolyte fills, and welds compared to its current operations. Such a strategy opens the doors to massive cost reductions that could help bring down the prices of electric cars to a notable degree.

1) An order of magnitude fewer cells required in each pack. That's 1/10 the number of rolls, cans, electrolyte fills, and welds.

The cell also appears to be designed for cell-to-pack drop in— The Limiting Factor (@LimitingThe) September 16, 2020

But regardless of its actual size, the design of the Roadrunner cell appears to be optimized and designed for a cell-to-pack drop-in setup. Interestingly enough, the leaked image of the Roadrunner cell seems to have a tabless electrode design, which Elon Musk has dubbed is “way more important than it sounds” last year. Provided that the Roadrunner cells are indeed inspired by Tesla’s tabless electrode patent, the new form factor could pave the way to more performance and further reductions in production costs.

What’s even more notable is that these improvements become possible with just the Roadrunner cell’s new form factor and design. Giesige, for his part, has noted that with the Roadrunner cell’s design and potential 54×98 form factor alone, Tesla may be able to close in on 300 wh/kg before making any significant changes to its battery chemistry. Elon Musk actually mentioned a 30-40% improvement from 250 wh/kg back in 2018, which translates to an improvement to 325-350 wh/kg. Musk’s prediction was considered fantastical by critics then, but as Battery Day approaches and leaks start to emerge about the event, it is starting to look more and more likely that 325-350 wh/kg is feasible.

Watch a feature on the Roadrunner battery cell leak in the video below.

News

Tesla opens massive solar Supercharger station in California

The Supercharger opened to customers ahead of Fourth of July weekend, while Tesla continues phase two of construction on the site.

Published

2 hours ago

July 7, 2025

Zachary Visconti

Credit: Tesla Charging | X

Tesla has officially launched the first several Supercharging posts at a massive station in California, notably including solar canopies and grid-scale batteries to offer completely renewable charging.

Last week, Tesla announced on X that it opened the first 84 Supercharger stalls of a planned 168-stall station in Lost Hills, California. Additionally, the massive Supercharger project features 11MW of solar canopies and 10 Megapack batteries for off-grid charging powered entirely by solar energy.

Tesla completed the first phase of the project just days ahead of the busy Fourth of July holiday weekend, adding that initial construction took just eight months. In addition to the remaining charging stalls, Tesla says it’s building a set of lounge areas, renderings of which can be seen below alongside current photos of the site.

Notably, the site also includes V4 charging posts for the company’s latest available charging speeds, and it’s located near the busy junction between I-5 and Highway 46 in Kern County.

“Thank you [Kern County] and [PG&E] for collaboration and approvals,” Tesla wrote in a follow-up post.

Credit: Tesla Charging | X

Credit: Tesla Charging | X

Credit: Tesla Charging | X

Credit: Tesla Charging | X

Tesla Supercharger Maps for North America, Europe, and Asia pic.twitter.com/0U5r0XRPyo

— TESLARATI (@Teslarati) July 2, 2025

READ MORE ON TESLA SUPERCHARGERS: Tesla launches ultra-fast V4 Superchargers in China for the first time

Testing at the LA Diner, plus Musk update on potential Tesla solar Gigafactory

The huge Tesla Supercharger station completed phase one of construction fairly quickly, especially given how long Tesla has been working on its unique Los Angeles diner, drive-in, and Supercharger location. Still, the company was seen performing some testing at the nearly-completed charging station earlier this month, and will reportedly be holding a job fair.

Elon Musk also responded on Monday morning to a post on X, suggesting that Tesla is “thinking about” building a U.S.-based solar Gigafactory in order to help support increased power needs with AI growth, and to bolster domestic solar production.

Tesla is building a new UFO-inspired Supercharger in the heart of Alien country

News

Tesla driver walks away from major accident with minor injuries

The driver sustained only minor injuries, and the exact cause of the crash remains under investigation.

Published

3 hours ago

July 7, 2025

Zachary Visconti

Credit: CHP Los Banos (via Facebook)

The driver of a Tesla Model Y survived and walked away from a harrowing accident on Monday in California, only sustaining minor injuries despite the vehicle being impaled by a guardrail.

On Monday morning around 4:34 a.m., the Los Banos division of the California Highway Patrol (CHP) responded to the accident on I-5 near Panoche Road, involving a 23-year-old in a Tesla Model Y. According to a post on social media, the driver veered off the road for unknown reasons in the northbound lane, before crashing directly into the guardrail and impaling the vehicle.

You can read the full message and photos from Los Banos CHP below, as were shared in a Facebook post on Monday afternoon.

This morning a Tesla model y was traveling in the #1 northbound lane of I-5 north of Panoche Rd. For unknown reasons driver allowed V-1 to veer off the roadway, travel through a dirt center divide, and crashed into the fixed metal guardrail. Lucky for the driver he only sustained minor injuries and was able to walk away. Driving a vehicle requires 100% attention to the road. Avoid distractions and focus on driving.

Credit: CHP Los Banos (via Facebook)

Credit: CHP Los Banos (via Facebook)

Credit: CHP Los Banos (via Facebook)

In a statement to SFGate, CHP officer Myles Anderson said that the driver only sustained minor injuries, while no arrests are made and drugs and alcohol are not suspected to have been involved. The report also notes that Tesla’s “cruise control and lane assistance features” were activated, according to Anderson. However, it’s not entirely clear if this is referring to Supervised Full Self-Driving (FSD), or to the cruise control and lane assist features baked into Autopilot.

At the time of writing, CHP has not yet responded to Teslarati’s request for clarification and additional details on the matter.

Tesla Crash Safety Ratings across its lineup: pic.twitter.com/ny30R7ceji

— TESLARATI (@Teslarati) July 1, 2025

READ MORE ON TESLA SAFETY: Tesla rolls out crucial new safety feature aimed at saving children

The news comes after Tesla has touted its vehicles as incredibly safe for many years. In December, for example, the company highlighted receiving top safety scores from regulators on four different continents throughout the world, including from the National Highway Traffic Safety Administration (NHTSA) and the Insurance Institute of Highway Safety (IIHS) in the U.S.

Tesla has also listed the goal of making its vehicles the safest on the road throughout the years, both in the overall design of its vehicles and in its Autopilot and Full Self-Driving (FSD) programs.

Tesla Model 3 ranks as the safest new car in Europe for 2025, per Euro NCAP tests

Investor's Corner

Cantor Fitzgerald maintains Tesla (TSLA) ‘Overweight’ rating amid Q2 2025 deliveries

Cantor Fitzgerald is holding firm on its bullish stance for the electric vehicle maker.

Published

11 hours ago

July 7, 2025

Simon Alvarez

Credit: Tesla China

Cantor Fitzgerald is holding firm on its bullish stance for Tesla (NASDAQ: TSLA), reiterating its “Overweight” rating and $355 price target amidst the company’s release of its Q2 2025 vehicle delivery and production report.

Tesla delivered 384,122 vehicles in Q2 2025, falling below last year’s Q2 figure of 443,956 units. Despite softer demand in some countries in Europe and ongoing controversies surrounding CEO Elon Musk, the firm maintained its view that Tesla is a long-term growth story in the EV sector.

Tesla’s Q2 results

Among the 384,122 vehicles that Tesla delivered in the second quarter, 373,728 were Model 3 and Model Y. The remaining 10,394 units were attributed to the Model S, Model X, and Cybertruck. Production was largely flat year-over-year at 410,244 units.

In the energy division, Tesla deployed 9.6 GWh of energy storage in Q2, which was above last year’s 9.4 GWh. Overall, Tesla continues to hold a strong position with $95.7 billion in trailing twelve-month revenue and a 17.7% gross margin, as noted in a report from Investing.com.

Tesla’s stock is still volatile

Tesla’s market cap fell to $941 billion on Monday amid volatility that was likely caused in no small part by CEO Elon Musk’s political posts on X over the weekend. Musk has announced that he is forming the America Party to serve as a third option for voters in the United States, a decision that has earned the ire of U.S. President Donald Trump.

Despite Musk’s controversial nature, some analysts remain bullish on TSLA stock. Apart from Cantor Fitzgerald, Canaccord Genuity also reiterated its “Buy” rating on Tesla shares, with the firm highlighting the company’s positive Q2 vehicle deliveries, which exceeded its expectations by 24,000 units. Cannacord also noted that Tesla remains strong in several markets despite its year-over-year decline in deliveries.