MBP shuts down suddenly when running in battery mode

Hi
I am from Zaragoza (Spain) and lately (about 2 months ago as I can remember) my mbp shuts down when running in battery mode and without any advice. I see some of you also have this problem.
I thought it was me not seeing the low battery indicator but last week I realized the battery was above 40%!!
This problem has been repeating and the battery level was between 40% and 60% when my computer shut down.
What am I supposed to do? My MBP is still in warranty and I bought it in the online apple store.
Thanks for the help.

In the system profiler it says the cycle count to 24. The laptop is from late March 2008.
The battery info is the following:
Battery Information:
Model Information:
Serial Number: Sony-ASMB012-3841-b0b7
Manufacturer: Sony
Device name: ASMB012
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 0110
Hardware Revision: 0500
Cell Revision: 0303
Charge Information:
Charge remaining (mAh): 1718
Fully charged: No
Charging: No
Full charge capacity (mAh): 1875
Health Information:
Cycle count: 24
Condition: Check battery
Battery Installed: Yes
Amperage (mA): -2133
Voltage (mV): 11757
I did the SMC reset, but I cannot complete the Battery Calibration, the laptop shuts down at half charge battery and does not go to sleep mode.
Thanks for your help.

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MBP shuts down suddenly when running in battery mode

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