i'm currently using a MBP 2.4 GHz Intel Core i5, and i want to know if there is any application that allows the macbook to automatically start/stop battery charge at certain levels. so i'm asking if there is any apps that: 1) i leave the A/C charger plugged in, but will not charge unless it reaches a certain battery percentage (e.g. 5%) 2) once it reaches that certain percentage, the charger will start charging 3) after the battery level reaches another certain percentage (e.g. 100%) then it'll stop the charge, but keep the charger plugged in so that the cycle can start again and the app does this automatically WITHOUT human supervision such app would be awesome! please reply!