02:40 09-05-2026

Tesla Semi Battery Capacity Confirmed: 822 kWh and 548 kWh

The California Air Resources Board confirms Tesla Semi battery specs: 822 kWh for Long Range and 548 kWh for Standard. Production is ramping up in Nevada.

Exact battery specifications for the Tesla Semi electric truck have surfaced in documents from the California Air Resources Board. The regulator has certified two versions: Long Range and Standard Range. This detail matters because Tesla had long kept the usable battery capacity under wraps, making it a crucial metric for buyers and fleet operators.

According to the filings, the Tesla Semi Long Range packs a usable capacity of 822 kWh, while the Standard Range version comes with 548 kWh. Both use NCMA lithium-ion chemistry. The documents also reveal identical power output—800 kW peak and 525 kW continuous.

Cross-referencing these figures with Tesla’s claimed efficiency of around 1.7 kWh per mile under full load, the long-range variant should manage roughly 480 miles (772 km). That’s close to the official 500-mile target (805 km). For the standard version, the math works out to about 320 miles (515 km), aligning with the stated 325-mile (523 km) goal.

The release of this certification data comes as Tesla prepares for a larger production push. In late April 2026, Semi program head Dan Priestley said that production at the Sparks, Nevada factory is ramping up to high volume. The site also manufactures 4680 battery cells, a move aimed at reducing reliance on external suppliers.