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Donut solid-state batteries tested, Tesla engineer quits, and solar value
A Tesla engineer has quit the company, coinciding with independent testing of Donut Labs' solid-state batteries which yielded unimpressive results. This highlights significant industry skepticism and the ongoing technical challenges for next-generation battery technology. For Tesla owners, it underscores that a revolutionary battery breakthrough is not imminent, keeping current technology as the near-term standard.
February 27, 2026