Tesla Semi Battery Size and Range Details Revealed

Official regulatory filings have now confirmed the battery specifications for the Tesla Semi, ending years of estimates and unofficial calculations. The long-range version uses an 822-kWh usable battery pack, while the standard model carries a 548-kWh pack, placing both among the largest batteries currently used in commercial electric vehicles.

The newly disclosed figures also provide a clearer picture of Tesla’s real-world efficiency targets, charging strategy, and plans for scaling electric freight transport.

Regulatory Filing Confirms Tesla Semi Battery Capacity

Tesla previously advertised the Semi with driving ranges of roughly 300 miles and 500 miles, depending on configuration, but the company had never publicly disclosed exact battery sizes.

That changed after documentation submitted to the California Air Resources Board (CARB) revealed technical specifications for both variants of the truck.

According to the filing, the Tesla Semi Long Range uses a battery with 822 kWh of usable capacity. Based on Tesla’s listed energy consumption of approximately 1.7 kWh per mile, the truck could theoretically travel around 483 miles under ideal operating conditions before fully depleting the battery.

The smaller Standard Range version uses a 548-kWh battery pack. Using the same efficiency estimate, that model reaches an expected driving distance of about 322 miles, closely matching Tesla’s published claim of approximately 325 miles.

Performance and Weight Figures Show Commercial Focus

The specifications highlight how Tesla is balancing range, payload, and performance for heavy-duty freight applications.

The Long Range Semi has a curb weight of roughly 23,000 pounds, while both truck variants maintain a maximum gross combination weight of 82,000 pounds, aligning with standard Class 8 trucking regulations in the United States.

Tesla lists peak power output at 800 kW for the higher-end configuration, generated by a three-motor rear-drive system. The Standard Range model is listed in regulatory paperwork at 525 kW, although Tesla’s public marketing materials have previously suggested both versions could access the higher output level.

Tesla Semi program lead Dan Priestley recently indicated that both 525-kW and 800-kW configurations may be offered depending on customer requirements and operating scenarios.

Shared Battery Technology With the Cybertruck

Both Semi variants reportedly use Tesla’s 4680 cylindrical battery cells, the same cell format deployed in the Cybertruck. The chemistry is based on nickel manganese oxide lithium-ion technology, designed to support high charging speeds and heavy-duty energy demands.

The battery packs are mounted beneath the cabin floor structure, helping lower the truck’s center of gravity. Tesla also uses a longer chassis layout on the Long Range version to create additional room for the larger battery pack.

For commercial operators, battery placement matters not only for handling but also for cargo efficiency and vehicle stability during long-haul transport.

Megawatt Charging Is Central to Tesla’s Trucking Strategy

Charging speed remains one of the biggest barriers for electric freight vehicles, especially in long-distance logistics. Tesla is addressing that issue through its dedicated Megacharger infrastructure.

The Semi supports charging at up to 1.2 megawatts (1,200 kW) through an MCS 3.2 charging connector, placing it among the fastest-charging production EVs announced to date.

Tesla says its Megacharger system can recharge the truck to approximately 60% battery capacity in around 30 minutes, significantly reducing downtime during freight operations.

The company has also introduced a secondary charging solution called the Basecharger, designed primarily for fleet depots and overnight charging environments. Unlike Megachargers, the Basecharger can deliver up to 125 kW without requiring a separate external power cabinet, potentially simplifying installation at logistics facilities.

Tesla Begins Expanding Semi Production

Tesla has recently started scaling up production of the Semi as it prepares for broader customer deliveries later this year.

The Semi represents a major test case for battery-electric freight transportation in North America. While passenger EV adoption has accelerated rapidly over the past decade, heavy-duty trucking presents different challenges involving payload limits, charging infrastructure, fleet downtime, and operating costs.

Large battery packs are necessary for maintaining range while hauling cargo, but they also increase manufacturing costs and vehicle weight. Tesla’s newly disclosed specifications suggest the company is prioritizing long-distance capability while attempting to keep efficiency competitive for commercial use.

Whether the Semi can achieve widespread adoption will likely depend on how quickly charging infrastructure expands and whether fleet operators can reduce operating expenses compared with diesel trucks over time.

FAQ

How large is the Tesla Semi battery?

The Tesla Semi Long Range uses an 822-kWh usable battery pack, while the Standard Range model uses a 548-kWh pack. These are among the largest batteries currently installed in production electric vehicles.

What is the driving range of the Tesla Semi?

Tesla estimates approximately 500 miles for the Long Range model and roughly 325 miles for the Standard Range version. Regulatory filings suggest the actual theoretical ranges are close to those figures based on energy consumption data.

How fast can the Tesla Semi charge?

The truck supports charging speeds of up to 1.2 megawatts using the Megawatt Charging System (MCS) standard. Tesla says the Semi can reach about 60% charge in 30 minutes with a Megacharger.

Does the Tesla Semi use the same batteries as the Cybertruck?

Yes. Both vehicles use Tesla’s 4680 lithium-ion battery cells with nickel manganese oxide chemistry, although the Semi uses much larger battery pack assemblies.

What is the Tesla Basecharger?

The Basecharger is a lower-power charging system intended mainly for fleet depots. It delivers up to 125 kW and does not require a separate external power cabinet like Tesla’s Megacharger system.

Why are Tesla Semi batteries so large?

Heavy-duty commercial trucks consume far more energy than passenger cars because of cargo weight and highway operation. Large battery packs are necessary to provide several hundred miles of range while carrying full freight loads.

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