My battery life is terrible. Always charge all night and always on yellow by 7 pm. I'm not a heavy email user, mostly play Draw Something and add to my food diary on My Fitness Pal. And I'm on wifi all day. What can I check to make it last longer?
Draw Something is a notorious battery hog. Probably your problem there.
I'd recommend you try GSam Battery Monitor from the app store. It doesn't save battery life, but it lets you track which apps/processes are using the battery up. You might find something that you can remedy.