[pxeboot]

Dell BIOS updates usually have a switch to override the battery check. I remember /force working on some models, and then they changed it to something more obscure

[stevekemp]

I googled the string in the DialogBox shown in the blog-post, "L502xa12", which lead me to a driver download page.

The binary supports "-force", "/forceall", "/forceit" and "/forcetype", amongst other command-line options.

So it looks like your memory is good!