i tried mine without 3g and wifi, off all the background app, the battery also drop in 1% in 10 minutes. in that 10 minutes only check whatapps for 1 minute. but when i off 3g, ppl hardly to call me. when i on 3g back, back to normal

Bros, my new iphone 4 (3days) JB OS 4.2.1 only last 8 hours with 3g/wifi off, brightness at 30%, all background apps are off when idle, play game for less than an hour, phone call around 15minutes and other normal chatting apps. is this consider normal?
my battery drop 1% in ten minutes which i use to check whatsapps and smses only for 1-2 minute.