Computer shuts off when unplugged, resets internal clock

I have been having an issue lately with my mid 2009 MBP 13in where occasionally if the magsafe adapter is removed from the notebook, it will suddenly shut off.  After about a minute, I am able to start it up again and it will be on battery power until I reset the SMC.  When it does load up OSX, the internal clock is reset to some date in 2001 and I have to manually change it back to the present for everything to play nice again.  It's been pretty annoying at times and I have no idea what would cause the computer to act up so sporadically.  I can't recreate the problem on command, it just happens when I least expect it.  The battery is fine as Coconutbattery shows a life of about 89% still.  Does anyone have any idea what and why this occurs?

Remove the battery and inspect for any abnormalities. Check the contacts on both the battery and the computer. Also check your battery status under Apple Menu> About This Mac. Click on More Info and then the System Profiler will come up. In the left hand column select Power and see what your battery status is there compared to what Coconut battery said.

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