With my 760's, I removed the spinning IDE(PATA) drives and use a CF2IDE adapter with a 4GB CF flash card... this greatly improved battery life (and for a router would be plenty fast enough).
Let my break out my kill-a-watt and test various AC adapters for draw in various situations... will report back
here is what i found:
1-6 powered off - chardged battery
*26-31 bios post
*23 idle - dos
*28-29 idle - login win95
*29-30 login - login sound
*24-25 disk access windows 95
*20 idle desktop
16 idle desktop (screen went off)
1 when not plugged into laptop
*22-24 during shutdown
*31 charging idle DOS
14-16 charging power on lid closed dos
13 charging (from 96%) power off
(this gradually dropped to 10 as it reached full charge, at which point the reading would occasionally change from 1 to 6ish and back)
then i switched to the Linux CF card...
*28-29 grub menu
*32-34 boot sequence
*24-25 login prompt
*32-34 during login
*24 idle at prompt
*30-35 during startx
*24 idle IceWM desktop
*17 idle desktop (screen went off)
*29 during shutdown X
*24 idle at prompt
*27-33 during shutdown -h now
*24 sitting at "System Halted"
* 4 watts lower in all modes when sliding brightness down to lowest, the monitor accounts for 4 watts when on at lowest brightness or 8 at highest)
At no time when the battery was 100% did the AC adapter draw 1 when the machine was powered on, so I assume when powered by AC the laptop only runs from AC and does not utilize the battery at all
Somewhere i got a spinning disk around, I'll check how much it draws over my poor man's SSD
plugged in a 2.1GB 17mm drive, all results were roughly 4 watts lower, except for drive accessing... like in dos, at c:\ doing dir /s both drives caused wattage to goto about 29 watts...
assuming this is the IDE chipset using more power along with the cpu.
both idle the CF drew like 4 watts less.