My rate is around 11475 mW as I write this, with the screen on low brightness, wifi on, touchpad off, and USB trackball connected:
If I turn off wifi and disconnect all USB devices, I can sometimes get it to go as low as 10500 mW.
$ cat /proc/acpi/battery/BAT0/state
capacity state: ok
charging state: discharging
present rate: 11475 mW
remaining capacity: 81210 mWh
present voltage: 16949 mV
To check if the nvidia card is actually off, this is what I do:
If the two characters after "rev" are "ff", you're good to go. Anything else, the card is still on.
$ lspci | grep 310M
01:00.0 VGA compatible controller: nVidia Corporation GT218 [GeForce 310M] (rev ff)
Battery life? I've never measured it scientifically, but in real life internet use (some Youtube, some reading, some posting), I'm guessing at least 6 hours.