Tesla Semi lists 4680 battery specs

The Tesla Semi story has mostly lived in demos, promises, and customer pilot fleets. That is why this filing matters. A California certification document appears to lock in the first hard battery numbers for Tesla’s production heavy truck — and they are more revealing than they look. The big surprise is not just that the Semi uses 4680-format cells. It is that Tesla seems to be hitting its range targets with less battery than many people expected. ### What actually showed up? The key document is a California Air Resources Board executive order tied to Tesla’s heavy-duty vehicle certification process. Reporting on that filing says Tesla listed two Semi variants: Long Range with an 822 kWh usable pack, and Standard Range with a 548 kWh usable pack. The same filing also identifies the chemistry as NCMA lithium-ion and says the truck uses Tesla’s 4680 cells. (electrek.co) ### Why is CARB paperwork a big deal? Because this is the kind of boring document companies usually do not publish for hype. CARB executive orders are compliance paperwork used to certify vehicles for sale and operation in California. Basically, this is one of the few places where a manufacturer’s exact configuration can leak into public view before a polished spec sheet does. That makes it more useful than an earnings-call aside or a social post. (electrek.co) ### Why do those battery sizes stand out? Back in December 2022, Elon Musk said the 500-mile Semi pack was “around 900 kWh.” Tesla’s current Semi page now lists 1.7 kWh per mile energy consumption, around 500 miles of range for Long Range, and around 325 miles for Standard. If the filing numbers are right, Tesla is getting close to those targets with a smaller pack than the old rough estimate implied. That is the interesting part — not just pack size, but pack size relative to range. (ww2.arb.ca.gov) ### So did Tesla get more efficient? That is the most reasonable read. An 822 kWh pack for roughly 500 miles works out better than the earlier back-of-the-envelope assumptions. One likely reason is vehicle weight and aero. Tesla has already said the Semi is built around low energy use, and the company’s Nevada materials have long framed the truck around sub-2-kWh-per-mile consumption. If the production truck is lighter and slipperier than early prototypes, the battery can shrink without crushing range. (tesla.com) That last step is still an inference — but it fits the numbers. ### Why do 4680 cells matter here? Because the Semi is exactly the kind of vehicle that stresses battery manufacturing. Heavy trucks need huge packs, and huge packs punish cost, weight, and factory throughput. Tesla said in January 2023 that it planned a 100 GWh 4680 cell factory in Nevada alongside its first high-volume Semi factory. So this filing is not just a chemistry footnote. It suggests Tesla is tying its in-house cell strategy directly to commercial-truck scale-up. (tesla.com) ### What about charging? Tesla’s Semi page says the truck is 1.2 MW charge capable and can recover up to 60% of range in 30 minutes using Tesla Semi Chargers. That matters because battery size alone does not make a long-haul truck usable. Downtime does. A truck with an 822 kWh pack sounds enormous — and it is — but megawatt-class charging is what makes that pack operationally plausible for fleet routes. (tesla.com) ### Is this proof Tesla is at real volume now? Not quite. Certification is not the same thing as mass deployment. But it does look like Tesla is moving beyond one-off pilot units and toward a clearer production menu — Standard and Long Range, with published range targets on the website and matching battery data in regulator paperwork. That is a more mature shape than the Semi program had a year ago. ### Bottom line? (tesla.com) The new detail is simple but important. Tesla Semi is starting to look like a real product line instead of a moonshot truck with fuzzy specs. And the most interesting part is not that the batteries are huge. It is that they may be smaller than expected — which usually means the truck got better. (tesla.com)