CMOS Errors/ battery failure in a Satellite L45

Question

I have a Satellite L45-S7423 laptop that is approximately 1.5 yrs old.  To give a bit of history on this baby..a week before the warranty ran out, the computer stopped working so we took it in to be repaired and it got a new motherboard and I believe power supply.  
Fast forward 6 months to now, and as of last night I have started getting a black screen on boot up that goes to American Megatrends.  There are a bunch of self checks (I assume thats what they are) check out as ok and then it beeps, and goes to a second page where at the bottom it says "CMOS battery low, and something about the date and time not being set.  I have options for F1 to load defaults and F2 to enter set up.  Pressing F1 loads Vista properly.   The computer now thinks it is permanently March 4 2008...but the time runs as you would expect.  It just is in accordance to either 11:00 or 12:00 when I reboot.  
I have noticed today after the reboot, that my antivirus vault settings have now been lost and I also started having issues with opening websites (security certificates not valid so it says or it completely blocks a regularly used site from opening).  Since the AV isnt working properly anymore I disconnected from the wireless network I use and turned off the wireless capability.
I run this computer almost non-stop, it has a chill pad after the October issue, and is updated regularly.  I do run down the main battery at least once or twice a week and recharge it completely.  Most of the time the laptop is on AC power though.  This issue came up after it was unplugged during house chores and my husband and I both forgot to plug it back in.  At most it was unplugged for a little over 2 hours.   I plugged it back in for 24 hours, and the most recent reboot still brings up the CMOS message.  There was an SD memory card in the card reader when I rebooted which I had forgotten about.  The only other oddity is that these problems started after a windows update ran on 3/13. 
What can I do for this?  Is it something I can fix by replacing the CMOS battery? It is NOT under the main battery where it was suggested to me that it might be....does this mean its on the motherboard?  If I press f2 for set up, what will happen? I also have a prompt to press f12 for BBS POPUP.  Thanks for your help and time.  
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Answer 1

OK, I attempted to disassemble the laptop following the "destructions" that were provided in an earlier post.   This portion of the project went extremely well...the directions were really easy to follow.  
The bad news is as follows....  I found the CMOS battery.  Either Toshiba, or the manufacturer of the mother board, american megatrends, soldered the stupid thing to the friggin motherboard.  I realized that this is above and beyond my level of skill, so I ran down the street to a small computer repair shop nearby and swallowed what little pride I have left.   I asked them if in fact my suspicions were correct in that the CMOS battery is soldered to the motherboard and they looked at it and went....EWWWW.  
I truly appreciate their honesty b/c they wont even touch this because they do not want to fry the motherboard.  They reccommend that I contact Toshiba at this point.  I will keep these folks in mind if I need computer repair work done in the next few years...
The experience was not a total loss to me though, because I now have a very good working knowledge of what different things look like in the laptop.  Even better, I put it back together and everything that did work, still works...haha.   One thing I did notice is that the repair place failed to replace all the screws...
I appreciate all the advice.  I did try taking the laptop battery out and running the computer for several days on just AC power...in 5 days it went from March 4, 2008 to March 6, 2008.   I will post an update when I hear from Toshiba...