i ve heard that if i want to exent my battery's lifetime, all i have to do is when i use my macbook at home, to extract the battery and use it plugged. so i will charge less times the battery. i called the shop where i bought the macbook and they told me that this is not true. A battery's lifetime starts when u first charge it and it doesn't matter if u charge it 100 or 1 times. Its lifetime will remain the same. i don't know what to do with my macbook. any ideas? what have u been doing and how long does your battery lives?