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If I'm not mistaken, Tesla still uses battery cells from Panasonic in their cars.

• aphextron 8y ago
  They do, but they have their own cell chemistry and they're really the only car manufacturer with their own production coming online soon at quantities high enough for volume.
  • marvin 8y ago
    Plus they do the battery pack design, construction and software themselves. That includes testing of what temperature, power draw and charging regimes cause degradation, how to keep the cells within a good regime while maintaining performance, when to cheat, how to prevent fires and so on. You don’t just put 7000 cells in parallel and call it a day. (Well, some manufacturers do, but the results vary).