Models & Pricing
Tesla Semi Battery Sizes Confirmed at 822 kWh and 548 kWh

Tesla Semi Battery Sizes Confirmed at 822 kWh and 548 kWh

Updated May 8, 2026

3 min read

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The California Air Resources Board has confirmed the battery capacities for the Tesla Semi, revealing an 822 kWh pack for the Long Range model and a 548 kWh pack for the Standard Range model. These capacities are smaller than the figures previously suggested by Elon Musk in 2022. This change may impact potential buyers' expectations regarding range and performance.

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Why it matters

  • The confirmed battery sizes may affect the range and operational efficiency of the Tesla Semi, influencing purchasing decisions for fleet operators.
  • Smaller battery capacities could lead to lower upfront costs, but may also impact the overall range and charging frequency required for long-haul operations.
  • Understanding the battery specifications is crucial for businesses assessing the total cost of ownership and operational logistics for electric trucks.

Reporting notes

EV Signal briefs are written to explain the verified change first, then add the context EV buyers and owners need to understand cost, availability, charging access, eligibility, or ownership impact.

If details are still developing, we try to say what is confirmed, what comes from secondary reporting, and what readers should verify before acting.

Source mix

1 linked source

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Reviewed from: Electrek.

Tesla Semi Battery Sizes Confirmed

The California Air Resources Board (CARB) has officially confirmed the battery capacities for the Tesla Semi, with the Long Range model featuring an 822 kWh usable battery pack and the Standard Range model equipped with a 548 kWh battery. This announcement comes through CARB Executive Order A-374-0095, signed on April 15, and marks a notable reduction from the battery sizes previously suggested by Tesla CEO Elon Musk in 2022.

What Changed

Initially, Elon Musk had indicated that the Tesla Semi would feature larger battery capacities, which raised expectations among potential buyers and fleet operators. However, the recent confirmation from CARB reveals that the Long Range Semi's battery is 822 kWh, while the Standard Range version will have a 548 kWh capacity. Both models utilize NCMA lithium-ion chemistry and Tesla's 4680 cells, which are designed to enhance energy density and efficiency.

Why It Matters for Buyers and Owners

The confirmation of these battery sizes has several implications for potential buyers and current owners of the Tesla Semi:

  • Operational Efficiency: The smaller battery capacities may affect the range and efficiency of the Tesla Semi, which is crucial for fleet operators relying on electric trucks for long-haul transportation. Understanding the range capabilities will help businesses plan their logistics more effectively.
  • Cost Considerations: While the smaller batteries may lead to lower upfront costs, they could also necessitate more frequent charging, potentially increasing operational costs over time. Fleet managers will need to weigh these factors when considering the total cost of ownership.
  • Market Expectations: The reduction in battery size may shift market expectations regarding the performance of the Tesla Semi. Buyers will need to reassess their needs and how these specifications align with their operational requirements.

Key Details from Source Material

According to the report from Electrek, the CARB Executive Order confirms that both battery packs utilize NCMA lithium-ion chemistry, which is known for its high energy density and efficiency. The Long Range model's 822 kWh battery is designed to provide substantial range, while the Standard Range model's 548 kWh battery is aimed at shorter routes. The shift in battery capacity from initial expectations could influence how fleets plan their electric vehicle integration.

What to Watch Next

As the Tesla Semi approaches its launch, it will be important to monitor further developments regarding its performance metrics, including range estimates and charging times. Additionally, any updates from Tesla regarding pricing or additional features will be significant for potential buyers. Fleet operators should also keep an eye on how these battery specifications compare to competitors in the electric truck market, as this could impact their purchasing decisions.

In summary, the confirmation of the Tesla Semi's battery sizes provides critical information for potential buyers and fleet operators, allowing them to make more informed decisions as they consider integrating electric trucks into their operations.

TeslaSemiBatteryElectric TruckCARB

Sources

These are the documents and reports used to build this brief so readers can verify the story directly.

EV Signal stories are AI-assisted, human-reviewed, and updated when verified details change. We prioritize source-linked reporting and practical context over generic filler. Read our editorial standards or send a correction via contact.

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