I need to change the coin cell battery in my Dell Latitude 8100, I don't know which panel on the underside to undo to find it.

why not read the manual at dell.com

all that is in the manual
or use youtube, search.

there are 2 batteries, the big one, that pops out
and the RTC coin cell inside.

You can skip the jumpers reset, by unplugging or removing the coin cell (CMOS) battery for at least 4 minutes. This works on all PC's whether laptops or desktops. This resets the NVRAM, just like the jumpers would do.

Dell Latitude C610 Notebook PC > Service Manual,

http://support.dell.com/support/edocs/systems/latd610/en/sm_en/index.htm

1) http://www.youtube.com/watch?v=5JqB4lkVxkA

2) Or take the laptop to the nearest authorized Dell repair shop; your ID, proof of purchase of laptop, and a credit card. Dell representative will ask Dell for a Master Password. Dell rep will then reset to NO password, or one you want. Dell rep KEEPS master password.

Removing CMOS Battery (Real Time Clock Battery. Also called Coin-Cell battery), will NOT work.

Regards,
joecoolvette

dells not gonna do **** for you.
removing the cmos battery wont work on these dells
again,
here's the pw for your computer:
jqhuulq3

Remove or disconnect the RTC/CMOS (coin-cell) battery from the motherboard. This will reset the BIOS to defaults and the password will be gone. Here is the Coin-cell information

Let me know if any further clarification/ assistance is required.

Good Luck!
CreativeTECH

BIOS passwork can be removed by temporarily disconnecting/ removing the RTC/ CMOS (Coin-cell) battery from the motherboard. The battery is underneath the keyboard. Click here for disassembly instructions and here are the details and graphic illustration about CMOS battery from Dell official Site.
Disconnect the coin-cell battery cable connector from the system board connector. It will reset the BIOS to its default setting and the password would be gone.

GoodLuck!
Dont forget to appreciate the solution if I could have been of any help!
CreativeTECH

CMOS Coin-cell is located under the keyboard. You have to remove the hinges cover and keyboard to access the coin -cell

Please study the following two links giving clear instructions about changing the coin-cell battery of Dell D630.

http://laptop-disassembled.com/latitude-d630/how-to-replace-the-coin-cell-battery-on-a-dell-latitude-d630/
http://support.dell.com/support/edocs/systems/latd630/en/SM_EN/coincell.htm#wp1113924

Let me know if any clarification is needed. Hope this helps!!

CreativeTECH

You may need to change the coin cell battery as well, it sits under the memory module cover. It's usually covered in a little blue plastic coating and has a red and black wire coming from it to a small white plug. You should be able to get a replacement for it at your local Radio Shack or electronics store. This battery is what keeps the time and date current on your machine.

Take out battery don´t work on Dell Laptops.
I got my Dell Bios & HDD Master Pasword within a few minutes from http://www.bios-password.kickme.to/

Only way to remove a BIOS password on any computer is to remove all power sources from the motherboard so its memory can be cleared.

First, remove the main battery from the laptop. Then you must locate and find the little coin cell battery (It looks like a watch battery) on the laptop and remove it for about a minute or so. Then you can replace them in the opposite order.

Your coin cell battery is in a bay on the bottom of your computer. Enjoy!
1. Before removing the coin battery:

• Remove the AC power.
• Remove the battery.

2. Locate the memory module cover on the bottom of the system.
3. Use a Phillips screwdriver to remove the two screws securing the cover.

4. Lift and remove the cover from the system.

5. Locate the coin battery.

6. Use a fingernail (or small flathead screwdriver, if necessary) to release the battery ZIF connector.
7. Remove the battery from the chassis.


8. Reverse the previous steps to replace the coin battery.