So I've noticed this VERY recently.. and this is pretty much happening after I had to replace my MagSafe adapter because the wires were being exposed and the adapter got super hot and stopped working. Anyway, after I got that replaced, I've noticed that my MacBook doesn't keep it's battery life while in sleep mode anymore! I charge it during the day and I use it a little bit before going to bed, and then I close the lid. Usually, when I open it back up in the morning, I still have a bunch of battery life left... now, it open it and it's giving me the Low Battery warning! I'm wondering if this is because of my MagSafe problem? Or was that just a coincidence and all batteries do that after a while? I've had my MacBook since September 2006. Any help would be much appreciated! Thanks!