I have a Macbook Pro 5,1 (late 2008) model. I recently read various articles and reviews that companies such as RAMJET, etc have tested this model with 8GB RAM as long you have Snow Leopard. So, that is exactly what I did. I upgraded to 8GB and the MBP rocks and has no issues. However, lately, here is what is happening: After a full charge, I turn on the MBP and the battery shows 99% and then within 20 minutes (I timed it using a stopwatch), the MBP goes down to 86% and on and on. The brightness indicator is only one square filled, no bluetooth, no time machine. I do have VirusBarrier X6 by Intego installed and four Safari windows opened. I checked System Profiler and my Power data shows the following: Cycle Count: 184 Condition: Normal I have to admit that when I am not using my MBP, I turn it off and I keep it plugged into wall charger all the time and do not unplug it after the charge light shows green. I thought it was the 8GB RAM that was the culprit however I have asked people on other forums and other people who have upgraded are not reporting any issues. So now I am left wondering is it time to replace my battery? Can someone help me out? I would very much appreciate a response. Thanks.