Battery recalibration: didn't stop, simply shut down

i planned to calibrate my Macbook Pro battery, so yesterday night i let the battery get very low (after having recharged it completely), the battery level alert appeared, and after some minutes the MBP shut down.
it didn't stop, it actually shut down: no white led in the right corner, nor the computer restarted from where i leaved my work when today i turned it on again. there could be something wrong?
p.s.: i also noticed that clicking on the battery icon there is written "service battery" with a warning icon: what does it mean?

The computer will shut down when the battery gets very low. You can only restart with the power adaptor plugged in. You should then leave the power adaptor plugged in until the battery is fully recharged. When fully recharged (if it will recharge at all open System Profiler and click on power to find out the battery condition.
As your MacBook Pro is a similar age to mine it's possible that you do need a new battery, especially if you regularly run off the battery. System Profiler will give the current full charge data as well as how many cycles the battery has been through. If the battery is not less than 80% and has completed fewer than 300 cycles then Apple considers that you've had fair life from the battery. There was a replacement program for batteries that didn't reach this standard but I think it has been closed as all the suspect batteries are now probably more than 3 yrs old anyway.
Post those SP stats for the battery and we can easily assess whether you have to face the cost of a new battery.
Neville

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