I have wifi, 3g, edge, gps, screen to off. Yet, it appears my battery is emptying in a day (the "cell standby" is the reason according to About Phone). The building I am in is blocking the signal often, so I know the phone is trying hard to get a signal. I did charged the phone completely before using it the first time! However, I had a Samsung Galaxy (1500 mAh) before. With the same settings, I could definitely last 2 days, under the same conditions. Anyone has an idea how to improve that? Thanks.