Lol - as i was writting this post - my battery was running on self power after having done a power recalibration. Lasted 5 minutes. CRASH. My battery is irratic. After just 13 months my battery acting up. I heard rumours that update 10.2.3 damaged certain powerbook batteries. Many recorded irratic battery behaviour after installing the update. I.e. soon after installing the update their batteries deteriorated at a rapid pace and within a few weeks their batteries "died". ---------- This is the current state of my battery. 1. Battery is at 96% 2. 10 minutes later - no change in battery level. 3. Then - Comp crashes. Skips sleep altogether. 4. Plug in power cable - grey lines run down the screen --------- If the power cable is plugged in i dont expirience any of these problems. These "grey lines" only appear after a battery crash. ---------- I am an expirience mac user and know how to treat a battery. I.e. dont charge it up from halfway. Run the battery down before charging it up. I have tried a number of things including power calibration and all the advice on the apple website. Is this normal behaviour? Is this due to 10.2.3? Is it a problem with the battery? What can be done?