My battery life has to be at least as good as before, possibly better. I have the official extended battery. Yesterday my phone was unplugged for a total of 12 hours, I listened to Pandora for about 8 hours, did 10-15 minutes of web browsing, and watched Netflix for about 25 minutes. By the time I got home from work I was at 50%. That's about what I've been getting before with listening to Pandora all day.