A wifi connection will eat your battery very fast. Turn off wifi, bluetooth, GPS whenever not in use to help conserve power. Turning down display brightness will help as you already mentioned that you did already. Also keep in mind that if the phone is constantly switching from 4G to 3G (and vice versa) or constantly for the network, it also drains faster. Too many possible factors to nail down just one cause.
Hi everybody. I've just bought a Samsung Galaxy S3 about a week ago and I've found that the battery life was pretty lame, it's so much lower than what Samsung claims in their commercials. For exemple when I pull it from the charger with 100 of battery percentage, I'm able to get 4 to 5 hours of screen time (screen at max brightness connected to wifi). I use it for browsing the web, watching videos and playing games. Is it normal or do I have a problem with my device and/or battery? I would really apreciate your help.