Please look here:
http://live.gnome.org/GnomePowerManager/FAQ#My_time_to_discharge_is_always_incorrect_due_to_a_faulty_battery.2C_what_can_I_do.3F
Please look here:
http:// live.gnome. org/GnomePowerM anager/ FAQ#My_ time_to_ discharge_ is_always_ incorrect_ due_to_ a_faulty_ battery. 2C_what_ can_I_do. 3F