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CMOS Battery location Dell Inspiron 3800

Last response: in Motherboards
January 3, 2009 2:27:48 PM

I bought really old inspiron 3800 and the bios does not hold the data. So I bought the CMOS battery because I thought it is a problem of the laptop but I can't find a battery anywhere on motherboard nor battery socket. Could anybody point me if this laptop comes with battery and where should I put it or solder it or what can i do to prevent loosing bios data? Thank you for any info.
a b V Motherboard
January 10, 2009 8:54:56 PM

I'm about to do the same for an old 3700.

I think you need one of these :

The instructions are available on the Dell support site - note that they call this thing the 'reserve battery', not the 'backup battery'.

For the 3700, it goes like this ( from ) :

Reserve Battery

To remove the reserve battery, perform the following steps.

NOTICE: The reserve battery provides power to the computer’s RTC and NVRAM when the computer is turned off. Removing the battery causes the computer to lose the date and time information as well as all user-specified parameters in NVRAM. If possible, make a copy of this information before you remove the reserve battery.

1. Remove the main battery.

2. Remove the device from the media bay.

3. Remove the keyboard assembly.

4. Remove the display assembly.

5. Remove the palmrest assembly.

6. Turn the palmrest assembly over.

7. Remove the two 4-mm screws securing the palmrest bracket.

8. Lift the palmrest bracket and turn it over, taking care not to twist the touch-pad cable.

9. Disconnect the reserve battery cable from the connector on the palmrest bracket.

10. Remove the reserve battery from the palmrest bracket as follows:

a. Tear the reserve battery free from the foam pad.

b. Remove the remnants of the foam pad from the palmrest bracket.

NOTE: When you replace the reserve battery, first connect the reserve battery cable to the connector on the palmrest bracket. Then position the reserve battery on the palmrest bracket to minimize slack in the cable.