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Some more info on the product page: https://www.whoop.com/thelocker/whoop-4-0-vs-3-0-whats-new/

The new device has 17% improved battery capacity which allows it to maintain the same battery life at 2/3 the size. Not groundbreaking overall, but could make a big impact for wearables. 2mm shaved off an Apple watch, for example, would make it way more comfortable.




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