Agree with what the others have said, don't bother with any battery saving app, use androids own power management setting, run task manager and kill any programs running in the back ground, and a good one is to knock down the brightness of the screen a little.
I also have a app called clean master, which does a good job of deleting all the junk files, and from that program you can disable of lot on apps you will never use (you can' delete them as they are factory installed, but disabling them saves power)