I used WP clock for months on my Fascinate knowing it was killing my battery life. I couldn't help it, it was so nice to look at haha. Anyway I put it on the Bolt and realized pretty quickly that it had to go. If you look at the devised website, his last few releases were addressing battery life issues, but I haven't noticed any difference. Anything Live Wallpaper related is going to tax the battery to some extent.