Hello, I have a 13inch MBA, late 2010 version. Question #1: I'm thinking of updating to the retina MBA once it comes out, but meanwhile, I was wondering if it's time that I replace the battery. I haven't been using my MBA much for the last two years (once a week or so) and these days when I turn it on I realize I get around 3 hrs max from it. When I look at my battery stats though, it shows: Health: 84~85% Cycles: 499 only and I've been told that it takes around 1000 cycles that the battery starts to fail. Anyone know why it's been only getting around 3 hrs, without any intense work? All I do really is internet surf and write. Is the health level of the battery decent? or in need of change? Question #2: I'm not sure if this is the correct place to ask this question, but if I decide to sell instead and upgrade, what is the current value of my MBA? (how much can i sell it for?) Here's the specs: Processor 2.13 GHz Intel Core 2 Duo Memory 4 GB 1067 MHz DDR3 Graphics NVIDIA GeForce 320M 256 MB Software Mac OS X Lion 10.7.5 (11G63) Thanks so much for reading this!