Thanks for the review. We should see more reviews comparing SSD and HDD battery life, but reviewers just ASSUME SSDs will be better at it.
Implementation details matter, and you can only see that by testing it.
Though I'm not a fan of using the Y700 for the test. The HQ chips do not have anywhere near the power management capability of the U chips. To be clear, its just about U series having lower TDP, but much lower idle as a platform.
I'm not sure whether such tests can be done reliably on a U platform as there may be drive specific optimizations done, and make the numbers irrelevant for actual products. But if its possible, U platforms would show greater differences in battery life between drives.