I've said it before WHr is the only relevant factor. You can see a 43WHr battery in both 3 and 9 cell formats. But lets say its small, which is a reasonable assumption.
The Sony Vaio T15 is a touchscreen, 15-inch, U Ivy Bridge chip with 43WHr battery. The battery time is actually not from my XPS 12 with much smaller screen and 47WHr battery. The difference is only 10% normalized to battery capacity.
You'll see some gains in battery life with cheaper non-Ultrabook systems, but the gains will be far less. The 50-70% battery life gains will get reduced to 10-20%, because they have to cut down on component costs. Price vs quality is very well there, but that difference will be amplified.
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