回答“Replaced battery but still has low lifetime”Hi, I have a similar question. I just bought a replacement battery for a MacBook Air 11" 2011 and replaced it successfully. Then I reset the SMC, charged the battery overnight and discharged it the next day. The battery lasted only about two hours watching YouTube videos. Did I mess up the process or is it the battery? PS: I didnt get the IFIXIT sheet either. Thanks!