Early 2011 Macbook Pro shuts off when charger unplugged.  Worked fine yesterday.

Hi,
I have an early 2011 Macbook Pro, which I purchased brand new; it's just over one year old.  Yesterday the laptop held a charge no problem for 6 hours or more.  Today, when I disconnect it from the charger it goes to sleep.  When I plug it back in and press the power button it wakes up, and I can use it.
This cannot be a battery issue, since it was holding a charge without trouble yesterday.  Does this appear to be a serious issue?  My one year warranty expired 2 months ago yesterday, and I had forgot to purchase AppleCare.  Sigh.  It almost seems like surgically-planned obsolecense or punishment for not purchasing AppleCare.
I would immensely appreciate any help/suggestions on this.
Thanks.

OK, in that case:
Reinstall OS X without erasing the drive
Do the following:
1. Repair the Hard Drive and Permissions
Boot from your Snow Leopard Installer disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Utilities menu. After DU loads select your hard drive entry (mfgr.'s ID and drive size) from the the left side list.  In the DU status area you will see an entry for the S.M.A.R.T. status of the hard drive.  If it does not say "Verified" then the hard drive is failing or failed. (SMART status is not reported on external Firewire or USB drives.) If the drive is "Verified" then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. If no errors are reported click on the Repair Permissions button. Wait until the operation completes, then quit DU and return to the installer.
If DU reports errors it cannot fix, then you will need Disk Warrior and/or Tech Tool Pro to repair the drive. If you don't have either of them or if neither of them can fix the drive, then you will need to reformat the drive and reinstall OS X.
2. Reinstall Snow Leopard
If the drive is OK then quit DU and return to the installer.  Proceed with reinstalling OS X.  Note that the Snow Leopard installer will not erase your drive or disturb your files.  After installing a fresh copy of OS X the installer will move your Home folder, third-party applications, support items, and network preferences into the newly installed system.
Download and install the Mac OS X 10.6.8 Update Combo v1.1.
Upgrading to Lion or Mountain Lion will not solve the problem.

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