I have a mid-2012 Macbook Air(2Ghz i7/256GB) that I want to get rid of. It holds no charge so it would need a new battery. What my best option of getting any kind of $$$ for this? I went thru Apple's trade in site and with a good battery it is estimated at $200 which seems very good. Thinking of replacing the battery and trading it in for whatever I can. Thoughts? I was actually going to toss it until someone told me I might be able to trade it in...