I was watching the battery level all day and it would make it up to 12% then it would stop charging. Then 15 minutes later it would drop to 11% and start charging again. I shut this thing down last night to let it charge for real and it made if up to 99%.

I've also run into a problem where if I tell it to shutdown then close the lid it'll just go into sleep mode instead. Then when I come back hours later to actually use the computer it'll immediately shutdown as soon as I open the lid. Terrible.

Apparently this isn't uncommon. I'll need to reset something with the batter controller software some time this weekend.

https://discussions.apple.com/thread/3707987?start=0&tstart=0