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the RTC battery and leaving it uninstalled for 5 or more minutes causes
all passwords and CMOS settings to be cleared. BIOS
password can be removed by temporarily disconnecting/ removing the RTC/
CMOS (Coin-cell) battery from the motherboard. Disconnect
the coin-cell battery from the system board and it will reset the BIOS
to its default setting and the password would be gone. Please
Refer to Page 29, 106 & 79 of the REPAIR MANUAL IBM T40 for Battery removal, keyboard removal and RTC battery removal instructions. The Backup Battery (RTC, CMOS) is located under the keyboard. So you have to remove the keyboard to access the battery. The above Manual from IBM shows the exact method/ instructions and pictures for laptop dis-assembly for the purpose. If you are comfortable with working inside such electronics, you
can't do it yourself, or else you may seek help from local laptop service
Hope it helps! Good Luck! Thanks for using Fixya! CreativeTECH
Remove the battery by following these steps:
a. Turn the computer upside down with the front panel
1. Remove the memory module compartment cover
2. Disconnect the RTC battery cable 1 from the system board.
3. Remove the RTC battery
The RTC battery is secured to the computer by double-sided tape.
Reverse the above procedure to install the RTC battery.
1~try to download service guide of your laptop.
2~learn how to reassemble the laptop.
3~ find the the location of RTC battery.
4~take the RTC battery off and wait 10 seconds.
5~put the RTC battery back to the RTC socket
1~BATTERY POSITIVE SIDE DOWN
Most Asus motherboards will reset the BIOS by removing the RTC battery.
This battery is the small one that holds onto information the computer uses when it is not turned on; like what time it is (that's why they call it RTC = Real Time Clock).
The location of this battery varies from pc to pc, however, it is almost certainly on the motherboard. If you are technical enough to disassemble the machine, I can get more details for you. Basically, you remove the battery, the RTC battery and the power plug for 5 to 30 minutes, then reassemble and power up with a clear CMOS. You will have to adjust the time on the unit after this.
Please check the manual at this link for the proper removal procedure. In the manual, go to Removal and Replacement Procedures, and then to 5.10 Real Time Clock (RTC) Battery. It will explain how to replace the battery.
Recently while at Geek Squad at Besy Buy I asked them the same question in regards to replaceing my Satellite A55-S106 computer. He (Geek Squad) explain to me they do'nt sell the lap top batteries but you can purchase them online and you can go to Toshiba direct and I know for sure they have them availble there. I cant spell today sorry,