So I still have my early 2011 15" MacBook Pro with an Intel i7 CPU and 8GB of RAM. The most I've done for this computer is replace that old 500GB HDD with a Samsung Evo 500GB SSD. I was considering picking up one of the new rMBP, but I own a iPad Pro and thought it might be a bit of overkill for myself to do. So basically, my question was if it was worth investing in a new battery since the charge doesn't hold as long as well as more RAM and possibly a replacement aluminum battery cover since mine is slightly sticking out. A while back I did get the logic board replaced since there was that whole free replacement program being done. Thanks for the help!