Hey, guys, I just got a new 2016 MBP and will be selling my old late 2011 MBP. Problem is that since I used to use it in closed clamshell mode, I didn't notice that the trackpad wasn't working until recently. After opening it up, I discovered that the battery has swollen. So, before selling the MBP, I want to replace the battery. I'm looking on eBay for OEM/refurbished units, but the prices vary quite a bit, so I'm wondering if the cheaper ones are less reliable. For example, would this one be much worse than this one? Other than the warranty difference, all the specs look the same on paper. I'd appreciate any advice. Thanks!