CMOS or RTC battery for this laptop : can it be replaced

http://www.irisvista.com/tech/laptops/toshiba-satellite-p105/take-apart-1.htm

http://www.irisvista.com/tech/laptops/toshiba-satellite-p105/big/toshiba-satellite-p105-17.jpg

Right there. Top of motherboard.

http://www.ebay.com/itm/CMOS-RTC-Battery-Toshiba-Satellite-P105-Series-NEW-/150447093156?pt=US_Motherboard_Components&hash=item23075875a4

RTC Battery.
Real Time Clock Battery. Same as CMOS Battery.


http://www.insidemylaptop.com/my-toshiba-laptop-displays-password-prompt-on-startup/

Regards,
joecoolvette

Download this service manual to assist you to locate the RTC/CMOS battery.
http://tim.id.au/laptops/acer/travelmate%20c110.pdf

You can get the RTC/CMOS battery from this WEB site.
http://www.pchub.com/uph/laptop/48-32138-4357/Acer-TravelMate-C110-Series-Battery-Cmos-Resume-RTC.html

How to replace the CMOS battery in your laptop
http://www.youtube.com/watch?v=MTg8qhWKNpA http://www.irisvista.com/tech/laptops/ToshibaM205/Portege_M205_disassemble_1.htm Dismantle portege laptop
this might not be your specific laptop it might give you some insight into its removal i have provided an ebay link showing the cmos battery and its connection lead
http://www.ebay.com/itm/Toshiba-Portege-R500-CMOS-Battery-BIOS-System-Clock-RTC-/330629760910

Date & Time are kept by RTC (Real Time Clock) CMOS Battery, which is usually a coin-cell battery on the motherboad.
As the RTC of your system is dead, it can not keep time.
Therefore, RTC (CMOS Battery) is required to be replaced with a new one to fix the issue.


Let me know if any further clarification is required. Hope this helps! Dont forget to rate the solution!!
CreativeTECH

Remove the CMOS battery from the motherboard. Turn it over, open it up, and look for a little watch battery.

http://www.tomshardware.com/forum/247842-30-replace-cmos-battery-toshiba-satellite

hi friend,

Probably a dead Motherboard battery. Need to enter the BIOS screens and reset values. Especially the time and date. Maybe the boot order and if using USB KBoard enable legusy USB devices. This will occur each time your friend shuts down and reboots until the battery is changed.
Issue
When you turn your Toshiba computer on, you see an error message like: **** Bad RTC battery ****
**** Bad Checksum (CMOS) ****
Check system, then press [F1] key The Real Time Clock (RTC) battery provides power for the internal clock/calendar and for maintaining system configuration settings.
This error can occur when a machine has been left turned-off for an extended period of time (around a month), and is the result of a depleted RTC battery. Other symptoms include not being able to execute Windows Update properly, errors/problems executing application software (like Norton Antivirus), and the appearance of the Windows XP "Desktop Clean Wizard".
Resolution This condition is easy to fix in 3 basic steps: Reset the BIOS defaults
Set the correct date and time in Windows.
Charge the RTC battery Please follow the detailed instructions in the next section.
Procedure Set BIOS defaults Press the [F1] key as instructed in the error message:
**** Bad RTC battery ****
**** Bad Checksum (CMOS) ****
Check system, then press [F1] key In the BIOS setup screen press the [Home] key to restore the default values, then press the [End] key to save and exit, then the [Y] key to confirm and restart the system. Set the correct date and time in Windows As Windows starts-up, you may see an error message about an "Invalid System Time". Go ahead and click "OK" to clear the error dialog. Open the Windows Control Panel and open the "Date and Time" control by double-clicking its icon. Set the correct date and time, then click OK to save. Charge the Real Time Clock (RTC) battery To charge the RTC battery, connect the AC adapter and turn the computer on (both the DC IN and Power LEDs must be green). Leave the machine on for approximately 24 hours to ensure a full charge in the RTC battery. Please note that the RTC battery does not charge while the PC is turned off, regardless of whether the AC adapter is connected or not. Other Information: If, on subsequent reboots, the "Bad RTC Battery" error persists, it's quite likely that you actually do have a bad RTC battery. If that's the case, you should contact a Toshiba Authorized Service Provider to have the system serviced. Windows XP Desktop Cleanup Wizard The first time you reboot Windows XP after resetting the system clock, Windows XP may try to run the "Desktop Cleanup Wizard". Simply Cancel the "Desktop Cleanup Wizard" at the first dialog. If you do manage to clean your shortcuts from the desktop and want to recover them, you will find them in a folder called "Unused Desktop Shortcuts". You can recover them as follows: Double-click to open the "Unused Desktop Shortcuts" folder
Click to expand the "Edit" menu, and click "Select All"
Drag the selected items back to your desktop
Close the "Unused Desktop Shortcuts" folder. You can delete this folder if it is empty.

thank u for using fixya

regards,
sivaranjini

That means that after computer had been off for a long time the CMOS battery has drained, and CMOS (BIOS) settings had been reset to default.

Usually the computer will work fine after pressing F1, but you may get wrong date and time.

Try charging battery completely, often the problem disappears, if it does not , then the choice is between pressing F1 each time you start the laptop, or disassembling the laptop and replacing CMOS internal coin battery, located on the lower side of the motherboard.

Replace Battery.

You'll need to gain access to the top of the mainboard, here's a good guide: http://www.irisvista.com/tech/laptops/ToshibaM45/Satellite_M45_disassembly_1.htm In case you don't know, the cmos battery is a round, flat silver object, coin-like. Good luck!