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Tesla’s ‘skunkworks lab’ for its custom battery cell pilot production line is growing

(Credit: CNBC)

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Tesla’s Battery Day may still be a couple of months away, but hints about the highly-anticipated event’s details are already abounding. With Elon Musk specifically mentioning that the event will be held in Fremont, and that it will include a tour of the company’s pilot battery cell production line, it appears that previous reports, which point to a “skunkworks lab” in the city, were accurate. What’s more, documents filed by the electric car maker in previous months seem to indicate that its mysterious pilot battery cell facility is growing. 

Initial leaks and reports about Tesla’s mysterious “skunkworks lab” were posted as early as June 2019, with a CNBC article stating that the facility is located at Kato Road, just a few minutes away from the Fremont factory, where the Model S, Model 3, Model X, and Model Y are built. Citing former and current Tesla employees, the news agency stated that Tesla’s R&D teams were focused on prototyping and designing advanced lithium-ion batteries, as well as new equipment and processes that could usher in the mass production of the next-gen cells. 

These batteries are now widely speculated to be the million-mile battery that has been mentioned by the company. The million-mile battery is a significant part of Tesla’s game plan, being the one defining factor that could help electric vehicles achieve price parity with gas powered cars, and allow battery storage devices to last decades when deployed. Amidst the wait for Battery Day, speculations are abounding that Tesla will be conducting a deep dive into its million-mile batteries during the event, similar to how Autonomy Day included an in-depth discussion on the company’s custom Hardware 3.0 computer. 

Tesla’s 2170 battery cells. (Credit: Tesla)

As it turned out, Tesla’s skunkworks lab at Kato Road has been very busy this year. A proposal submitted last March, for example, outlines plans to redevelop the existing site by adding floors to the facility. According to Tesla, the redesigned building will be housing 45 research and development employees and up to 425 manufacturing workers that are spread through several shifts from Monday through Friday. This appears to suggest that the company, as early as March this year, was looking to ramp the battery cell output of its pilot production line. 

Interestingly enough, Tesla has also been posting multiple job listings on its Careers page that were specifically focused on battery cell manufacturing. By May 2020, Tesla had posted job listings for Cell Engineers, Production Process Engineers, and Controls Engineers. A look at these listings would show references to a battery cell manufacturing operations, and as luck would have it, the posts listed Fremont, California as their location. 

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Further documents show that Tesla had also requested to increase its power demand by 6 MW, further hinting that activities in the site are poised to ramp soon. This proposal, based on a response from PG&E that was recently shared online, was approved. 

Based on these filings and job listings, it is evident that Tesla’s pilot battery cell manufacturing line has been ramping, or at least is poised to ramp, its operations. This is particularly impressive, considering that the Kato Road facility, which reportedly hosts the company’s skunkworks lab, is a fairly small site, comprising of two buildings that cover 184,880 sq. ft. combined. This means that even in this relatively small location, Tesla has been able to create a pilot line for a new breed of batteries that can change the EV game. This is quite a significant accomplishment, considering that previous battery lines are known to consume a lot of space. 

Tesla’s Gigafactory Nevada facility is the perfect example of this. Giga Nevada primarily produces battery cells, and it is poised to be one of the largest buildings in the world by footprint once it’s complete. If Tesla’s pilot battery cell production line in Kato Road is indeed fully functional and ramped, then one can only imagine how much more batteries facilities like Gigafactory Nevada can produce with the company’s next-generation technology. 

Tesla’s proposal for an expansion of its Kato Road facility could be accessed below.

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Tesla Kato Road Update by Simon Alvarez on Scribd

H/T JPR007

Simon is an experienced automotive reporter with a passion for electric cars and clean energy. Fascinated by the world envisioned by Elon Musk, he hopes to make it to Mars (at least as a tourist) someday. For stories or tips--or even to just say a simple hello--send a message to his email, simon@teslarati.com or his handle on X, @ResidentSponge.

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Elon Musk

Elon Musk’s last manually driven Tesla will do something no other production car will do

Elon Musk confirmed the Roadster as Tesla’s last manually driven car, with a debut coming soon.

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Tesla Roadster driving along sunset cliff (Credit: Grok)

During Tesla’s Q1 2026 earnings call on April 22, Elon Musk made a brief but notable comment about the long-awaited next generation Roadster while describing Tesla’s future vehicle lineup. “Long term, the only manually driven car will be the new Tesla Roadster,” he said. “Speaking of which, we may be able to debut that in a month or so. It requires a lot of testing and validation before we can actually have a demo and not have something go wrong with the demo.”

That single statement is the entire Roadster update from yesterday’s call, and while it represents another timeline shift, it comes as no surprise with Tesla heads-down-at-work on the mass rollout of its Robotaxi service across US cities, and the industrial scale production of the humanoid Optimus.

The fact that Musk specifically framed the Roadster as the last manually driven Tesla is significant on its own. As the rest of the lineup moves toward full autonomy, the Roadster becomes something rare in the Tesla-sphere by keeping the driver in control. Driving enthusiasts who buy a $200,000 supercar are not doing so to be passengers. They want the physical connection to the road, the feel of acceleration under their own input, and the experience of controlling something with that level of performance. FSD, however capable it becomes, removes that entirely. The Roadster signals that Tesla understands this distinction and is building a car specifically for the people who consider driving itself the point.

Tesla isn’t joking about building Optimus at an industrial scale: Here we go

The specs for the Roadster Musk has teased over the years are genuinely unlike anything in production. The base model targets 0 to 60 mph in 1.9 seconds, a top speed above 250 mph, and up to 620 miles of range from a 200 kWh battery. The optional SpaceX package takes it further, rumored to add roughly ten cold gas thrusters operating at 10,000 psi, borrowed directly from Falcon 9 rocket technology. With thrusters, Musk has claimed 0 to 60 mph in as little as 1.1 seconds. In a 2021 Joe Rogan interview he went further, stating “I want it to hover. We got to figure out how to make it hover without killing people.” Tesla filed a patent for ground effect technology in August 2025, suggesting the hover concept has not been abandoned. The starting price remains $200,000, with the Founders Series requiring a $250,000 full deposit. Some reservation holders placed those deposits in 2017 and are approaching a full decade of waiting.

With production now targeted for 2027 or 2028 at the earliest, the Roadster remains Tesla’s most audacious promise and its longest-running delay. But if what Musk is testing lives up to even half of what he has described, the demo alone should be worth waiting for.

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Elon Musk

Tesla confirmed HW3 can’t do Unsupervised FSD but there’s more to the story

Tesla confirmed HW3 vehicles cannot run unsupervised FSD, replacing its free upgrade promise with a discounted trade-in.

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tesla autopilot

Tesla has officially confirmed that early vehicles with its Autopilot Hardware 3 (HW3) will not be capable of unsupervised Full Self-Driving, while extending a path forward for legacy owners through a discounted trade-in program. The announcement came by way of Elon Musk in today’s Tesla Q1 2026 earnings call.

The history here matters. HW3 launched in April 2019, and Tesla sold Full Self-Driving packages to owners on the understanding that the hardware was sufficient for full autonomy. Some owners paid between $8,000 and $15,000 for FSD during that period. For years, as FSD’s AI models grew more demanding, HW3 vehicles fell progressively further behind, eventually landing on FSD v12.6 in January 2025 while AI4 vehicles moved to v13 and then v14. When Musk acknowledged in January 2025 that HW3 simply could not reach unsupervised operation, and alluded to a difficult hardware retrofit.

The near-term offering is more concrete. Tesla’s head of Autopilot Ashok Elluswamy confirmed on today’s call that a V14-lite will be coming to HW3 vehicles in late June, bringing all the V14 features currently running on AI4 hardware. That is a meaningful software update for owners who have been frozen at v12.6 for over a year, and it represents genuine effort to keep older hardware relevant. Unsupervised FSD for vehicles is now targeted for Q4 2026 at the earliest, with Musk describing it as a gradual, geography-limited rollout.

For HW3 owners, the over-the-air V14-lite update is welcomed, and the discounted trade-in path at least acknowledges an old obligation. What happens next with the trade-in pricing will define how this chapter ultimately gets written. If Tesla prices the hardware path fairly, acknowledges what early adopters are owed, and delivers V14-lite on the June timeline it committed to today, it has a real opportunity to convert one of the longest-running sore subjects among early adopters into a loyalty story.

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Tesla isn’t joking about building Optimus at an industrial scale: Here we go

Tesla’s Optimus factory in Texas targets 10 million robots yearly, with 5.2 million square feet under construction.

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Tesla’s Q1 2026 Update Letter, released today, confirms that first generation Optimus production lines are now well underway at its Fremont, California factory, with a pilot line targeting one million robots per year to start. Of bigger note is a shared aerial image of a large piece of land adjacent to Gigafactory Texas, that Tesla has prominently labeled “Optimus factory site preparation.”

Permit documents show Tesla is seeking to add over 5.2 million square feet of new building space to the Giga Texas North Campus by the end of 2026, at an estimated construction investment of $5 billion to $10 billion. The longer term production target for that facility is 10 million Optimus units per year. Giga Texas already sits on 2,500 acres with over 10 million square feet of existing factory floor, and the North Campus expansion is being built to support multiple projects, including the dedicated Optimus factory, the Terafab chip fabrication facility (a joint Tesla/SpaceX/xAI venture), a Cybercab test track, road infrastructure, and supporting facilities.

Credit: TESLA

Texas makes strategic sense beyond the existing infrastructure. The state’s tax structure, lower labor costs relative to California, and the proximity to Tesla’s AI training cluster Cortex 1 and 2, both located at Giga Texas and now totaling over 230,000 H100 equivalent GPUs, means the Optimus software stack and the factory producing the hardware will share the same campus. Tesla’s Q1 report also confirmed completion of the AI5 chip tape out in April, the inference processor designed specifically to power Optimus units in the field.

As Teslarati reported, the Texas facility is intended to house Optimus V4 production at full scale. Musk told the World Economic Forum in January that Tesla plans to sell Optimus to the public by end of 2027 at a price between $20,000 and $30,000, stating, “I think everyone on earth is going to have one and want one.” He has previously pegged long term demand for general purpose humanoid robots at over 20 billion units globally, citing both consumer and industrial use cases.

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