I was wondering if about 4 to 5 hours for battery life while streaming music and surfing the net is about right. I bought this Macbook used and it is in mint condition. It is a mid 2011 model purchased in early 2012. It had about 66 battery cycles on it when I bought it, so I am betting it was used plugged in most of the time. I appears the battery hold about 94 percent of its original charge. I have seen other threads on this topic but not for my exact model. I discharged the battery and recharged it several times to try to get the max life back on it. My setting are keyboard at 1 bar and screen at 60 percent with bluetooth off. I am wondering if getting a new battery would help or is that a waste of money? I do have all the power saver setting on. The battery say 6020 of 6700 mAh when fully charged. Any impute would be great. Oh!one more thing. If if did get an new battery and wanted to install it myself, what is a good site to buy one from?