I'm using 6 different protocols, and it isn't any noticeable difference than with them offline. I am getting 4 hrs of heavy usage per charge. I'm a pretty extreme user, always connected to WiFi and SIP, Power saving off, and constantly web browsing, chatting, emailing, Tweeting, managing my MySpace and Facebook profiles and contacts, and taking and sharing the occasional image. I'm satisfied, since I usually bring the average device's battery to its knees. It could use a better battery, nonetheless.