If i'm using 3g/hsdpa on all the time + some apps at background using internet like whatsapp (freakin amazing app) and ftp server, i get around 22 hours of moderate use. If i'm only on wifi + 3g for voice calls about 2 days. If i limit it to 2g + wifi, it's almost 4 days. Webcam apps : droidcam ; ip webcam I'm running android 2.2.1 JPU firmware + voodoo lagfix 5.0.2, So there is NO lag that the galaxy s is notorious for.