> Consumers do care about things like battery life.
For laptops, less than you'd think. A huge chunk of people buy laptops so they can work on the dinner table and then put their computer away easily when it's time for the family dinner.
Source: I spent about five years selling laptops to people. That was a while ago, but I don't think much changed here. If anything, things changed the other way (battery life is even less important for laptops than it was) since a lot of people also have a smartphone or tablet.
And as battery lives get longer, there are diminishing returns as well. The difference between 1 hour and 4 hours is huge. The difference between 4 and 8 hours pretty large. After that? Less so.
In my experience noise and heat (or rather, lack thereof) are more important, although also not hugely so for a lot of people, just more so than battery life.