2006-08-18: Battery Recall Program for Dell Notebooks
"From the Dell page: Dell has identified a potential issue associated with certain batteries sold with Dell Latitude™, [...] and Dell Precision Mobile Workstation™ notebook computers. [...] Under rare conditions, it is possible for these batteries to overheat, which could pose a risk of fire."
Please check your battery.
Detailed instructions are found here: https://www.dellbatteryprogram.com/
For linux users, there's a script available to ease the first step of identifying affected parts:
/afs/ifh.de/project/linux/Notebook/check_bat.pl
On an SL4 notebook, it will tell you whether or not any of the batteries in the device is potentially affected. It probably works on other linux flavours as well.