I just upgraded to the Note 2 from a RAZR MAXX that was just terribly slow. So far, I love the Note for its speed compared to the MAXX, but the battery life seems a little on the low side based on some of what I've been reading. After 9.5 hours I have 27% left. Over these 9 hours, 2 were playing podcasts, about 15 min. of youtube, and another 30-40min. maybe of random browsing/game playing. Is this normal, or will replacing the battery(with one that fits in the stock case) gain me a decent amount of time?