There are only 3 rules about battery life for "smart" phones on Android......(Why did they call it Android, and not something more interesting like Ingrid? or Anneka?)
1. Turn everything off whenever you can.
2. Keep an eye on Settings/Applications/Battery Use. See what has been using your battery. If it is something other than Display and/or standby, and or phone idle, then turn it off. e.g. Daughter used Farce-book, which downloaded some sort of chat thing. Used up the battery in 2 - 3 hours, even with everything off. Deleted the App., problem solved)
3. See rule 1.