Hello everybody. I'm a proud Macbook (5,1 aluminum) owner, and it is my first device into the Apple world. I've had it a little over two years now and for the past fews days I've noticed my battery life is now speeding down faster. Coconut reads a (3822 mAh) current capacity and its design capacity reads at (4100 mAh). The Macbook itself is in great shape, no scratches, no dents, or any other physical damage whatsoever. Battery life has come down a little though, since before I could actually get 4 hours in total with the same lighting specs. I can clock in maybe 2:30 hours of use with high backlight and high keyboard light. I'm very much interested in purchasing an SSD for the Macbook and to also get an HD optibay for my current HD to maybe squeeze a little more life out of the computer and I could also just buy a new battery to renew the whole thing. I want to know a few things from you guys, do the newer Macbook models really make that much of a difference in speed, etc. compared to my computer model? Is it really worth the upgrade? I could look into selling the machine and just paying the difference for a newer one. How much would I get for one of these? Regards.