As ShaneOG pointed out, the new ones have a 1060 which should have better power consumption profiles. But also worth noting is battery life is going to depend

As ShaneOG pointed out, the new ones have a 1060 which should have better power consumption profiles. But also worth noting is battery life is going to depend on what your task load is. For my typical use case, I end up usually hammering on CPU for dev work so my battery life on my MBP isn't actually as impressive as it is for light use (web browsing/typical user workload). So for me, the potential battery life gap between a Blade and 13" MBP is going to be fairly close. Also worth noting, the Dell Sputnik I have is comparable to a MBP and it is running Ubuntu natively (!!!). Throw an slim external battery in (Dell sells one) and it seems to exceed my MBP battery life (although I haven't really rigorously tested it). Finally, drop the screen resolution down to the 1080 version and you will get better battery life. Not appropriate for everyone, but it's a compromise you can choose to make if it works for you :)