No sleep mode at low battery - data loss and time reset

I'm having this issue for about a year now:
When I run my macbook pros Battery down, there comes the low battery warning. After a while the system just goes down without suspending anything to my harddisk. When I restart my computer it does a normal start and after logging in I'm experiencing a lot messages due to the reset time. I correct my system-time and restart my mac and the system is back to normal.
Usually I'd say: Replace your CMOS-Battery (I know I have an EFI-Firmware), but where is it?. Or in other words: Is there a "System"-Battery, that would prevent my mac from forgetting the time?
Since I'm not running down my battery to 0 very often I only experience this issue from time to time and never took time to do anything about it.
I would also appreciate a workaround so that my mac immediately starts shutting down, after the low battery warning. That would be great.
iStats battery-Status says: Health:83%, Cycles:333, charge 50%...

Well, the problem, seem's to have reoccured: Battery ran out (even the indicator leds on the side didn't show any life), Time reset to 1.1.2001, again some rebooting and setting the time again...
Is this a sign of a degrading battery health status?
It looks like reseting the SMC didn't help after all.

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Hi TJK, Thanx for answering,
My MBP have already a three months bought, what i should do, call to apple or to dealer?
I supposed its in warranty yet. THX
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No sleep mode at low battery - data loss and time reset

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