Hello, I have a 15" MacBook Pro, 1.83 GHz Core Duo. A couple weeks ago my computer stopped giving the "reserve battery power" warning and just clicks off spontaneously with usually about 30-40 minutes of battery power left according to the timer. Also, when it's charging, it will go from "Charged" to "Calculating" off and on throughout the charge cycle and the light on the charger changes from red to green and back every few seconds. I just want to know if there is something wrong with my battery, and if there is a way I can get the reserve battery warning to come back on again. Thanks so much!