Low battery window

It started when I had Tiger installed, and after installing Leopard the problem remains.
I used to get a window saying that I was running "On reserve power" when the battery level was too low, and since some time ago I don't see this window anymore, and the computer just "dies".
Is there a place for setting this "announcement of low battery"?
Thanks
Pedro

Have you done the battery update? About Battery Update 1.2.
You might try to reset the SMC (System Management Controller)
No there is no place to set it it's automatic.

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