Updating ThinkPad Bios

[ThinkPad560X]

I have a IBM ThinkPad 770 and going to update the bios version and I know everytime "on older ThinkPads using floppy bios update" It says notebook must be pluged into wall outlet and have a fully charged battery. The battery on my 770 is not charging and will not install the new update. How do I update without a charged battery, I don't feel like buying a new battery when I just use my 770 at the desk.

[sarbin]

have a look at:
http://forum.thinkpads.com/viewtopic.php?p=94013#p94013
http://forum.thinkpads.com/viewtopic.ph ... 95#p378095

use at your own risk...