I had an Infuse when it first came out, loved it but the battery life was killing me. I couldn't get through 6 hours with barely any use even with a custom kernel. I switched to the Note when that dropped. I now have another Infuse as my backup phone because I love the feel and design (squared corners) but still found battery life to suck. However, I did 2 specific things from this list and I noticed a HUGE difference, too bad this wasn't around at first. The two that helped me where to freeze all the AT&T bloatware (minus the hotspot locator I need) and use wifi when possible. My battery usage is now on par with my Note, maybe better which is amazing. Seems like AT&T bloatware is a big culprit with battery usage. 4G is a killer but we already knew that, just not to the extent the Infuse shows.