Hello, My MBP is 4 years old, and had the battery replaced when it was about 1 1/2 years old. In recent months it has begun to show definite signs of wearing out, but I have hesitated to replace it due to the cost, and figured I'd just deal with being tethered to a power source more often than I'd like to. A couple of days ago, I noticed the computer was whining up and getting hot when I wasn't doing anything, except Firefox was running. Then just last night, I was browsing unplugged - not downloading anything or running video or music - just browsing. And before I knew it (like in a half hour), my battery was down to 26%. Same thing happened this morning. I have a widget called iStatPro, which shows a running process called DirectoryS..., that's consistently taking up 92-96% of my CPU usage (see right side of attached screenshot), which is running around 50%. So my question is: does this seem like a battery issue, or is there something else going on? How do I track down the problem?