Yesterday I had the phone on without Widget Locker for 14 hours and ended up at about 30%. With Widget Locker (non updated version) the phone would've been dead 3 hours ago. Again, this is the non updated version. I'll go a couple of days more without the app and then activate it again in order to see what the battery life is like. I hope it works as I really liked the features it had as I liked having the camera and flashlight easy to access as well as able to read an email without having to unlock.