after reading thru the posts, this is my understanding on the battery usage.

whenever i was at office, i keep my MBA charged or with power plugged in.

when i was on the move, i will just use my MBA until i go home or office then charged it..

another enquiries, if example i had finished appointment and go back office, but i not plan to use the MBA, do i need to charge it? or only wait until the next use on plug in the power?