Toshiba Portege M400 PPM40U01000E Tablet PC "clock loses time" Questions

...clock of my computer doesn't work when I turn off the computer and it is aways slow. even when the computer is on it doesn't work properly. Please help me for the solution This means that the cmos ...

...time I turn it on, I have to reset all setting, It will not save setting after it is turned off. I.E clock, and date: some times wireless settings depending on how long it was off. Cmos batterie? Hi, ...