If your forgetful about charging battery, what's to say you won't forget after 2 days?
Some customers ask why we close our business at 5:00pm, I tell them "if I was open until 7:00pm you would ask the same question", "why do you close at 7:00pm". My point is, these same customers who say that can't get there by 5:00pm, always seem to get there before 5:00pm, they figure it out!
If you are worried about forgetting to charge your battery, that is your own negligence, and the battery with the Air 2, is not that diminished to cause you your example scenario to be any different.
From what I'm reading a lot of the same people that complained about Ram have moved to battery! Apple responded to what I understand, was the biggest complaint, Ram. Now we got 2GB of Ram, extra core, 55% faster multi core performance, faster overall, better screen and yes thinner!
I like the move to thinner and lighter, that's progress, and in turn forces others to keep moving forward, as with battery tech etc., and well the competition!
What people aren't looking at (IMO), is how Apple continue's to make products thinner, lighter, faster and keep battery performance close to the same.
I've always carried a backup battery for my iPads & iPhone's there was a possibility I would not have time to charge. Most of the time it's in my truck or backpack when traveling. Funny thing is, I've never used it for myself, only friends and family. It's always the same ones that use my external battery, never keeping their **** charged.