MacBook shuts down at 30-35% battery level: any suggestion please?

My MacBook (13" unibody) shuts down at 30-35% of battery level without any warning. I have the impression that it began to happen after I installed the Snow Leopard upgrade. I got the computer on Dec. 24th 2008. Any suggestions, please?
This is the Battery power information and Hardware Overview on my MacBook:
Battery Information:
Model Information:
Serial Number: 9G84706533NYB
Manufacturer: DP
Device name: bq20z951
Pack Lot Code: 0000
PCB Lot Code: 0000
Firmware Version: 002a
Hardware Revision: 0005
Cell Revision: 0100
Charge Information:
Charge remaining (mAh): 1494
Fully charged: No
Charging: Yes
Full charge capacity (mAh): 2697
Health Information:
Cycle count: 262
Condition: Check Battery
Battery Installed: Yes
Amperage (mA): 511
Voltage (mV): 12239
Hardware Overview:
Model Name: MacBook
Model Identifier: MacBook5,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2 GHz

Hi azuzeno, welcome to the forums and happy holidays,
About Batteries. http://www.apple.com/batteries/
From //www.apple.com/batteries/notebooks.html
"Battery Lifespan For Apple notebooks with removable batteries — such as previous generation MacBook and MacBook Pro computers — a properly maintained battery is designed to retain up to 80% of its original capacity at 300 full charge and discharge cycles. You may choose to replace your battery when it no longer holds sufficient charge to meet your needs.
Your battery info state "Cycle count: 262" So your pretty close to the 300 cycle limit. Just like an older car, old batteries can behave erratically. It's time to buy a new battery.
You could also book an appointment for the Genius Bar. http://www.apple.com/retail/geniusbar/ They may be able to save you a few dollars.

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Note: Here are two pictures that shows stats about the battery:
1- http://jump.fm/SAOBW
2- http://jump.fm/JBHYI

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Battery Installed: Yes
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