Do you buy a lot of tablets or do you find most to have unacceptable battery life? The battery on my 2013 Nexus 7 is crazy good as far as I can tell and lasts for days of moderate use even two years into its life span. Compared to my phone which likes to die partway through the day even without me touching it.
As it says I can leave my laptop at home so then I would hope it rivals my x220 or t100 both of which get 12-14 hours with me coding and browsing under Ubuntu. I do not care too much about performance usually as long as it is not annoyingly slow.