Hi everybody! Apple newbie here. I hope somebody could help me with this Please bear with me as this could be long. I bought MBA 13" last Sept. 11 and at home, I saw that it already has 2 battery cycle count. As per BTB SA, I drained the battery and charged it fully the next day. As of yesterday, my 1-week old MBA already has 6 battery cycle counts. I know I should keep the cycle count low, I just wanted to test out the battery if it's really going to give me a more or less 12hr battery power and during the first few days, it really gave me that. Yesterday, when I plugged in the magsafe adapter, it sparked and I heard tiny fizzing sounds but stopped when the adapter was fully plugged in. Admittedly, I'm using a very old power extension cord but I charge all my gadgets using it. Tiny sparks are quite normal using that cord, but it was the 1st time that I heard those fizzing sounds. When I unplugged it, I noticed the 2 prong's tips have dark marks, I think burnt marks, on them. But when I wiped it with a dry cloth, I was able to wipe off most of it. Last night, when I used my MBA, unplugged, I think the battery was draining faster. I started using it at 7:10PM at 96% and at around 1:45, it's down to 67%. Chrome, Viber, Mail, and Spotify were open but Spotify was not playing anything. I downloaded Coconut Battery and design capacity is at 99.8%, current charge < full charge with a difference of 160 at 76%. OS X battery status is good. But in Apple's energy saving estimate, the battery is just going to give me around 10.5 hrs. Am I just being anxious over nothing? Or something is really amiss? Please help me!! Thanks!