The 10-minute battery charge is not here for us yet, but one can dream. Also, I already have an extended battery (3500 mAh) that works well. I'm often a heavy user, and this has significantly extended my battery life. But lately I've been tiring of the bulk, and want to be able to use some cases. I'll still use it when I know I'm going out for a while, but I've been thinking about getting an extended battery that will still fit with the regular backing. So, a little extra juice than stock battery, but same size. I'm just unsure of the difference these batteries make. I found one that's 2520 mAh. Does anyone have experience with these slim extended batteries? Will there be a noticeable difference in battery life, or I might as well just stick with stock and the extended battery I currently have?