I just followed the directions in the link and it worked.  You're not replacing the battery.  You're taking it out (following directions) and putting it back in for a reset.  Just make sure you follow the directions.
The last update 2.011 for the XPS 8940 bios throws errors in windows event viewer:  Die Energieverwaltungsfeatures für den Leerlauf sind für den Prozessor "11" in der Gruppe "0" aufgrund eines Firmwareproblems deaktiviert. Wenden Sie sich an den Computerhersteller, um aktualisierte Firmware zu erhalten. The idle power management features are disabled for processor "11" in group "0" due toa firmware problem. Contact the computer manufacturer for updated firmware   Some ideas to stop this?  
Bios update XPS 8940 from 2.3.2021 Version 2.011 throws errors in windows event 
viewer