One thing I did that made a huge difference in battery life was to
Menu-settings-wireless & networks-mobile networks-and uncheck "enable always-on mobile data"!
Everything will still sync, as before, just won't always be looking for a connection for nothing!
Second thing is to
Menu-settings-wireless & networks-Wi-Fi settings-menu-advanced-Wi-fi sleep policy and set it to "after 15 mins"
Most will already know this but some might not.
These two things have added 30-40 % to my battery easily.