Running the battary till it shuts off?

[B Mohrgan Pratten]

Hello list, Thanks to those that helped me with my last question :-) I have a IBM ThinkPad 390X (2626MOU). That is working fine with RedHat 6.1. To maximize battery life I understand that it is good idea to drain the battery right down to the point that the computer must turn its self off. Does any one know of a safe way to do this while running linux? As I am sure you know, if you do this now your hard disk will not get cleanly unmounted and fsck must be run next time you boot. Not having dos on my hard disk I am wandering if there is a way to perhaps remount the root partition '/' as read-only when the battery gets down to say 1% and unmount the other partitions. I believe this would allow the computer to run till it was forced to turn off do to insufficient battery power. I think that doing this manually would be the only sane solution. If anyone knows how to do this or has a better suggestion pleas let me know. I kind of think that someone should sell a battery discharger. Any thoughts Mohrgan.