Never ever again with Lenovo. My aunt has the yoga one, and it's doing dump and self controlled things by some Lenovo program that is meant to help in some way.
What is even more bad, with that insane resolution if the display, she needs to zoom with 300%, but on the Lenovo machine, some elements don't get the zooming.
On my personal Surface 3, not the pro, I also have zooming, because of the resolution above FullHD. But it is all the same zoomed, everything working.
If you really want and a working system, then get a Surface product, not any third party crap.
If you want ling battery life, you need to take the lowest power consuming hardware, which is the Surface 3 Atom processor. I definitely have 10 hours plus and minus 2, in the evening playing Xbox remote , using it over the day for office and learning.
Surface is an amazing product.