Good question. I'm going to give it to a electronic shop if possible.
Hey, I just finished changing my MacBook Air 13" mid 2012 battery myself and it was a piece of vegan cake. This helped a lot. I had no problems with the manual/guide. I just had some screws issues like the screws were worned out. Overall, these steps were easy to follow. I hear that batteries that are not original would kill the mother board or another part in about 2 months so I hope not. I will try to check back on this thread later to keep y'all posted. Today is 07/25/17, I would like to post another note on 09/26/17 and say it still works. I saved money and would recommend doing things yourself if possible. Again, thank you.