By Tesla has finally revealed the official battery specifications for its long awaited Semi electric truck, giving the clearest look yet at the technology behind its heavy duty hauling ambitions. The new figures confirm that Tesla equipped the Semi with some of the largest battery packs ever used in a production electric vehicle.
The details appeared in official certification documents published by the California Air Resources Board. Until now, Tesla had avoided sharing exact battery capacities for the Semi, leaving analysts and EV experts to estimate the numbers through range and efficiency calculations.
The documents show that the Tesla Semi Long Range model uses an 822 kWh usable battery pack. Tesla claims the truck can travel close to 500 miles while carrying a fully loaded trailer. Based on the company’s estimated efficiency of 1.7 kWh per mile, the official numbers closely match Tesla’s earlier range promises.
The Standard Range version uses a smaller 548 kWh battery pack. Tesla estimates this model can deliver around 325 miles of driving range under full load conditions.
Tesla focuses on long distance electric trucking
The Semi represents Tesla’s push into the commercial trucking industry, where long distance hauling creates major fuel costs and emissions. By offering large battery capacity and fast charging support, Tesla aims to make electric trucks practical for freight companies that operate on busy highway routes.
Both Semi versions support a gross combination weight of 82,000 pounds, which matches the legal maximum weight for many commercial trucks in the United States. However, the Long Range model carries a heavier chassis because of its larger battery pack.
The official documents also revealed differences in performance between the two versions. The Long Range Semi produces up to 800 kW of power through a three motor setup. Meanwhile, the Standard Range model delivers up to 525 kW.
Tesla previously suggested that both trucks offered the same power output, so the updated figures provide more clarity about the lineup.
Charging remains one of the biggest talking points for the Semi. Tesla says the truck supports charging speeds of up to 1.2 megawatts through its Megacharger system. With this setup, the battery can recharge to around 60 percent in roughly 30 minutes.
The company also introduced a lower power charging option called the Basecharger. This unit delivers up to 125 kW and targets fleet depots that may not require ultra fast charging infrastructure.
Tesla builds both Semi variants using its 4680 battery cells, which also power the Cybertruck. Engineers mounted the battery packs low inside the chassis to improve balance and stability during highway driving.
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The release of the official specifications comes shortly after Tesla confirmed that the Semi has entered mass production. Earlier production remained limited, with only a few hundred units built for pilot customers and testing programs.
Now, Tesla plans to scale up manufacturing at its Nevada facility and begin broader customer deliveries later this year. Freight operators and logistics companies continue watching the Semi closely as the commercial EV market expands across North America.
The newly released specifications also show how quickly battery technology has evolved in the trucking industry. Large battery packs, faster charging systems, and improved efficiency now allow electric trucks to compete with diesel powered long haul vehicles in ways that seemed difficult only a few years ago.
