Just completed my battery replacement and everything is working perfectly (with currently several hours of use). When removing the screws, I found it a little difficult using the iFixit brand "P5 Pentalobe Screwdriver". This is the screwdriver with the yellow handle. It felt as though it didn't actually enter the screw holes and was just barely fitting into it. I haven't used it, but I recommend the $11-12 one, especially if you plan on performing this procedure on other macbooks.
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