No sleep after battery depletion

Hello guys!
I have an MBR from 2006. In the last time I noticed that when battery reach about 10% my computer is turned off without any warning. Today was the second time.
It's my battery (I still have the original battery) or as I read in one of the posts I should reset SMC?
thanks!

You could try an SMC reset, hirohito, but if this is the original battery in your MBP then it is almost certainly just getting too old to function properly under load. Take it to an Apple Store or authorised service provider and get it tested.
The internal resistance of Lithium batteries increases with age (and to a lesser extent with use). When the resistance increases to a certain level it is no longer able to deliver power at the expected rate. Once this occurs you will experience unexpected shutdowns instead of the computer going through the normal sleep processes. The computer may also start to shut down suddenly, even with lots of charge left, if you use it for any CPU intensive activity such as rendering video, or even possibly watching a "Flash" based movie on the internet.
Many users have found that with the batteries in the pre-unibody MBPs they are lucky if they can get two years of life out of them. You have done well to have yours continuing to behave for as long as it has!
Cheers
Rod

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