Toshiba tecra battery??

does anyone know about the toshiba tecra 9000 battery options in the bios?My battery lasts about a half an hour and the shows 1 hr left and then it goes all the way down to 3 minutes.I think something in the bios needs to be changed??can anyone help?

Answers:
I have a tecra 8100 and it does the same thing, is your batt. old? Your power supply is basically a big rechargeable battery. When they get older they tend to hold less of a charge and keep going out sooner and sooner. You can fix this problem by buying a new one.

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