While I am not new to Apple, being familiar enough with iPod, iPhone, and iPad to get by...I am still a little stumped with my most recent purchase a Macbook Air. So, you are probably going to have to talk me through it like a 5 year old. I am relatively tech savvy and a quick learner, but there is still a learning curve, going from PC to Mac. So, right now, I am on my second charge. Straight out of the box, it had 11-12 hours of battery life, and I think it probably got close to that. However, when the battery ran out, I charged it. At full charge, it indicated about 8 hours battery time, but actual time ended up being around or just under 6 hours. I chalked it up as a fluke, but on my second charge, at full charge, it said 7 1/2 hours. I have only run Safari at this point. I've learned enough to find the Activity Monitor, and for Safari, the Avg Energy Impact is around 64, which I figured was probably pretty high. I don't even know what software I am using; I don't know anything about Mavericks or Mountain Lion or what version I am on. Suggestions on figuring out why my battery is draining so quickly?