The same thing. But with its very low cycle count, your battery shouldn't be dead unless it's more than two years old or has been mistreated. How old is it? Do you keep your MBP plugged in practically all the time, and not drain and recharge the battery at least every two or three weeks? Has your MBP ever gotten hot enough to sleep or shut down spontaneously? Have you ever left it in a parked car in the sun in the summertime for a few hours? Left it unused for a long period (several weeks or months) with a drained battery or a fully charged battery? Any of these events and practices can cause permanent damage to a notebook computer battery, usually taking the form of a loss of full charge capacity. That capacity normally diminishes gradually over the battery's useful lifespan as its cycle count and chronological age increase, but Apple says a properly maintained notebook battery should retain 80% of its original full charge capacity after 300 charge-discharge cycles. Depending on which MBP model you have (it isn't the late-2008 unibody model, which can't run OS X 10.5.4), your battery is now somewhere around 15% of its original charge capacity after 1/4 of that number of cycles. So unless the battery has been abused, it's apparently defective.
