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Apple switched to DDR4 when the 2018 Macbook Pros were released which allowed them to support 32 GB of RAM.

The rated battery life of the Macbook Pro didn't change between 2017 and 2018.

The rated battery life may not have, but the actual, real world experience battery life certainly has. Speaking as the user of a. 2019 MacBook Pro with the DDR4 that I use for work.

I find myself scrambling for a power supply way more often than I ever did with my 2017 15" MacBook Pro.

Even with the older battery in the 2017, with more cycles, I get a longer battery life out of it than the 2019.

And I have the complete opposite experience. Pinning this on the switch from LPDDR3 to DDR4 seems like a very weak conclusion. Especially when it is known that processors and displays are the largest consumers of energy and the 2019 MacBook Pro boosts way higher with more cores than the 2017.

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