I have an iPhone 3G, and I usually charge it every night to 100% heading into the next day. I usually go on the Internet when I have free time at school(during passing periods), and listen to music(during advisory, while I'm working on something). After the school day ends, the battery life is usually around 45-50%. Is that normal? BTW, I only go on a few apps(Facebook, Twitter, an ESPN app, and checking my email), and go on Safari a little bit. Sometimes all I do is go on Facebook and Twitter to check what's going on, and my battery goes down around 5 percent. I don't know why it's draining so fast. I have the brightness a bit less than half way, also. Just wondering if this is normal and if it happens for other iPhone 3G users. Also, it would be great if you guys have any helpful tips.