wow this is really intense.....
Try the obvious.....Look at the screen brightness....options/screen keyboard/backlight brightness and set it to 0. Then see the battery performance.
OS update is definitelt a possibility.
There are threads for that here. So search and u will find plenty.
wifi/bluetooth/gps/games bleed the battery. so avoid or do minimal usage. GPS works best with a car charger connected.
See if this link helps....
http://www.chumedh.com/bbwiki/tiki-i...20OS%20Upgrade