Are there any apps to diagnose a Macbook battery? My girlfriend's battery won't last 1 second, so it obviously needs replaced.

But I just bought a new battery from Apple a few months ago and it seems to discharge extremely quickly.  Are there any apps out there that would help me diagnose if I just need to buy another new one?
On my MacBook, if I opt-click on the battery in my menu bar, it gives me current the condition of my battery.



You can also use iStat to show the current state of your battery.