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Disagree. 2016 15" MBP was 4.0 pounds. 2019 16" MBP was 4.3 pounds. New 16" MBP is 4.5 pounds. Apple simply decided in 2016 to shrink the size and weight by removing ports and other things, and then to increase the size and weight by bringing them back.

Personally I'm surprised they didn't decide to keep the same weight by shrinking the battery. Not that many people absolutely need a 21 hour battery life, though it is nice.

Pretty sure the batteries are bigger in the new ones vs the Intel ones, at least in capacity (6000mAh vs 5000mAh). I imagine they are the same physical size; if not bigger.

Apple isn't sacrificing any battery size on the 16" at least. 100-watt-hour is the standard max size for TSA.