I have a 2009 Macbook Pro. I realize the little LED's on the side of the laptop tell me how much life the battery has when pressed but I am wondering what other tasks get carried out in there. Recently my battery stopped working. I had an "X" in the battery icon and the battery said "no battery available". So I ordered a new battery and replaced it only to find that it did not detect the new battery either. I must admit I was a bit worried. So I took it out and looked for other causes to my problem. When I removed the indicator board I could see that is was totally corroded and I ordered a new one. I have not yet installed the new one and I will re-post my findings, however, what other problems might be caused by this board failing? Does anyone out there know all the tasks this thing carries out? I have another laptop that forgets the time periodically as if the battery was totally drained even though it is still fully charged. Might this also be the root of that problem.