yo i have some battery benchmarks for all of you when using the integrated video on the e1705
with screen @ 1 notch below max and wifi on, minimul cpu usage: 4 hours 6 min.
with screen @ 3 notches below max and wifi off, minimal cpu usage: 4 hours 28 minutes.
with screen @ 1 notch below max and wifi on, dvd playback: 2 hours 45 min.
All tests were performed using a 6 cell battery ^^
for a 9 cell, i assume you can multiply these numbers by 3/2
that worked for my 9300...