My Macbook shuts off immediately when unplugged and will not start up unless it's plugged in. This just started last night...I was using it while it was charging and then unplugged it when it got to 100%, and it immediately shut off. Prior to this, it seemed to be charging and running fine. It also runs fine plugged in. I did some searching and tried some of the suggestions I found...shutting down, taking the battery out, holding down the power button for 5 secs, and replacing the battery...making sure the connectors were clean, downloading battery update, etc. Nothing helped. I also read an article about how the lithium polymer batteries will just quit suddenly like that instead of running down gradually. So I'm hoping all I need is to buy a new battery... But my question is this: Since the system profiler shows the battery health is "good," does this indicate something else is the problem? Or will it still show it's good after it completely dies? Here are the stats according to System Profiler: Charge Information: Charge remaining (mAh): 3955 Fully charged: Yes Charging: No Full charge capacity (mAh): 3956 Health Information: Cycle count: 1047 Condition: Good Battery Installed: Yes Amperage (mA): 0 Voltage (mV): 12526 And according to Coconut Battery: Current battery charge: 3955 Maximum battery charge: 3956 99% Current battery capacity: 3956 Original battery capacity: 5020 78% Battery loadcycles: 1047 Age of your Mac: 39 months Charger connected: Yes Battery is charging: No I am just now learning about these things, so apparently 1047 cycles is a good life for the battery. I just want to know that this is the only problem so I can order a battery and be done with it. Wish I could run it over to the Apple store and have them check it, but it's an hour and a half away, so if I do that, it'll have to be later in the week or next week. Naturally, I don't want to be patient and wait.