Some quick things that could save you some battery:
- dissable 4g when you are not using it if you have a gsm hit 2g networks only..
- Turn bluetooth and GPS on when you need them power them off when you are not using them. there's a nice widget you can add to your homescren to keep those settings in check.
- if you are a chatter. install chat apps that use Push. a nice example:
a) msn, facebook chat: Trillian
My phone lasts for something like 20 hours (on normal use) but I recharge it every night.. (when I go to sleep I plug it in). If you are a heavy user you can consider buying a better battery, or keeping a small solar powered powerbank in your bag..
Device: Galaxy Nexus
ROM: Paranoid Android 3+
Device: Acer Iconia A500