Citation needed pretty much everywhere.
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They kept the same battery in the "improved battery life" model and switched to 16nm process chips while retaining the same clockspeeds. If they increased them in the OLED model that significantly, then that battery life estimate should have changed.
Same goes for overall dimensions, nothing's changed. Unless you want to make the claim they made the joycons bigger, while retaining the exact same proportions and position of the buttons and analogs.