A look at Sila Nanotechnologies' new battery model, which ships in the new Whoop wearable, and may fuel a change in energy storage for electric cars and more (Cade Metz/New York Times)

Cade Metz / New York Times:
A look at Sila Nanotechnologies' new battery model, which ships in the new Whoop wearable, and may fuel a change in energy storage for electric cars and more  —  This week, a more efficient type of battery arrives in a wristband fitness tracker.  It could soon reach smart glasses, cars and even aircraft.

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