Tesla’s 4680 battery cells are underperforming and frustrating buyers

Electrek
By Fred LambertMay 7, 2026, 12:50 pm402 ptsTop
Five years after Tesla (TSLA) unveiled its 4680 battery cell at Battery Day with promises of 5x the energy, 6x the power, and 16% more range, the data tells a very different story. Tesla’s homemade cells consistently deliver worse energy density, worse charging performance, and less range than the supplier…

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