My MacBook recently started shutting down without giving the battery warning. It consistently does it at 8% battery left. I'm running OSX Leopard and the computer is 3 years, 4 months old. AppleCare ran out 4 months ago. According to both Coconut Battery and the system profiler the battery's condition is good. When it does this I get a shutdown cause of -128, which I have googled and cannot seem to find anywhere. Does anyone know of any way to fix this without buying a new battery? The battery still holds 82% capacity so I don't want to replace it.