No low battery warning and shut down

My MacBook is no longer showing the "low battery" warning and even with the batery status showing charge suddenly shuts down. If I check manually pressing the button of the bettery flashes 2 or 3 lights.
I have calibrated the battery several times but i am having problems doing it again because after the shut down there is still charge in the battery.
I have OS X 10.5.8 and all the software updates done.
Thanks.
Dan

Same Problem is happening to me. I have a Late 2008 13" Aluminum Macbook. If some one knows what to do please post. Thank you
Información de la batería:
Información sobre el modelo:
Número de serie: 9G84703BA3NYB
Fabricante: DP
Nombre del dispositivo: bq20z951
Pack Lot Code: 0000
PCB Lot Code: 0000
Versión del firmware: 002a
Revisión de hardware: 0005
Revisión de celda: 0100
Información sobre la carga:
Carga restante (mAh): 1223
Totalmente cargada: No
Cargando: Sí
Capacidad de plena carga (mAh): 3285
Información sobre el estado:
Número de ciclos: 182
Condición: Normal
Batería instalada: Sí
Amperaje (mA): 1253
Voltaje (mV): 11966
Ajustes de alimentación del sistema:
Alimentación de CA:
Temporizador de reposo del sistema (en minutos): 180
Temporizador de reposo del disco (en minutos): 10
Mostrar temporizador de reposo (en minutos): 20
Reinicio automático en caso de corte de alimentación: No
Activar al cambiar el modo de alimentación: No
Activar al abrir la pantalla: Sí
Activar al acceder a la red local: No
Fuente de alimentación actual: Sí
El reposo de la pantalla utiliza atenuación: Sí
Carga de la batería:
Temporizador de reposo del sistema (en minutos): 15
Temporizador de reposo del disco (en minutos): 10
Mostrar temporizador de reposo (en minutos): 5
Activar al cambiar el modo de alimentación: No
Activar al abrir la pantalla: Sí
El reposo de la pantalla utiliza atenuación: Sí
Reducir brillo: Sí
Configuración del hardware:
SAI instalado: No
Información del cargador CA:
Conectado: Sí
ID: 0x0100
Potencia eléctrica (W): 60
Revisión: 0x0000
Familia: 0x00ba
Número de serie: 0x00cd1692
Cargando: Sí
Message was edited by: Alfonso Sánchez

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