Galaxy S4 Battery Drain I recently got an S4, and the battery drain is huge. I'm not even using it with a SIM card yet because it is that bad. 

Over 10 hours, Phone idle used 36%,  and time on was 10 hours 29mins. The screen used 23% at 9mins 20s. 

Any idea how to make this battery last longer?
It's your apps and services running in the background. Try to kill as much proccesses as you can. I used to put different apps in pause mode just by hitting home button, and I noticed the battery draining like crazy.

I also killed lots of services in App Manager (All proccess tab). I found lots of useless services draining my CPU and battery. Try that.