Earlier today, I noticed that my macbook wasn't charging while the computer was put to sleep. Snow leopard told me that i should "replace soon" which seemed better than "replace now". So I turned off my machine and plugged in the magsafe to see if it would charge at all. The indicator light on the magsafe was yellow? i had never seen that before but it definitely wasn't green or orange. I have a blackbook and in the process of writing this, I noticed my battery icon now has an X on it and states that there is no battery available (it's plugged in right now). Also iStat no longer has any info on my battery, but when I push the button on my battery, it lights up 2/5. So it's pretty much decided that I need to replace my battery. I'm strapped for cash right now, so even buying a $50 battery off of Amazon is inconvenient for me. Does this mean that I can still use my macbook whenever it is plugged in or will it turn off soon and become unusable unless i get a new battery?