When running on battery power, my MBP shuts down after 30 mins..please help

this has been happening for the last two weeks; whenever i run my MBP on battery, it goes blank/shuts down after about 30 mins...would start back on, but shut down even before the login screen comes! i checked the battery display under the laptop-it showed 3 green lights!! TIA!! i bought my MBP off the apple website last september!

With your symptoms, most likely, yes. If you have a 17" MBP, you are out of spec (based on Apple's specification of 80% health for 300 cycles). If you have a 15" MBP, you're in spec (84% health), but your symptoms indicate a problem (i.e. a defective battery). So, contact AppleCare!
You can't calibrate now. I asked because if a battery goes too long (150-220 cycles) without calibration, the "sudden loss of power" can result.
Hope this helps...
Graham, that's why I inquired about calibration, but with the OP's cycle count, that's not the issue. Also, FYI the "battery condition" information is part of System Profiler with Leopard; the OP lists Tiger, and did post all the information available under Tiger.

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