Fortunately I was able to use the slightly bigger pentalobe ...

The bits are too soft. I used the P5 screwdriver to open up my Macbook Air Mid 2012. By the time I was done replacing the battery and needed to screw the bottom plate back on, the P5 driver had completely worn out. Fortunately I was able to use the slightly bigger pentalobe screw, but even that one is showing signs of wear after one use.

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