This week, a more efficient type of battery arrives in a wristband fitness tracker. It could soon reach smart glasses, cars and even aircraft. https://ift.tt/38XbzlG New York Times This week, a more efficient type of battery arrives in a wristband fitness tracker. It could soon reach smart glasses, cars and even aircraft. https://ift.tt/2VnW7LY This week, a more efficient type of battery arrives in a wristband fitness tracker. It could soon reach smart glasses, cars and even aircraft.By Cade Metz from NYT Technology https://ift.tt/2VnW7LY
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