To Mayer: Thanks for the coconut link; it says the battery has had 257 loadcycles. I'm not sure what that means.
To rdklinc: Thanks for the reply. Yes, it has happened many times and the computer has rarely crashed in the 3 years I've had it - and I said, it also crashed my husband's iBook, too. My laptop doesn't crash when it's on the adapter only - this only started happening two days ago when I put in the new battery. My old battery was weak, but this never happened. As for the calibration, that was just something I was doing because I just wanted to drain the battery and then re-charge it - I didn't get the chance because I can't get the battery to drain past 48%.
The company I bought it from will refund my money, but I still need a new battery....