Iphone4s shut down at battery level 30% when using 3G

hi,
i am gan from malaysia, iphon4s 6.0.1 user, phone age 1.5 years old
Recently have 1 unique problem to ask for buddy helps in here. thank you 1st for all.
my iphone4s shut down at battery level 30% when i use 3G service only, turn on 3G service to use around 5 hours to shut down my phone, from 100% - 30%.
but, it doesnt happen when i turn on my WIFI, or use normally.
hard reset - done..
soft reset - done.
itunes restore - done.
battery calibration - done.
battery - it seems not a battery problem because when i use WIFI, or normal use without data, i can use until 1% until phone shut down itself.
upgrade ios 7.0.4 - the battery could drain more faster if i upgrade to this firmware.
i have no idea, even i go for apple store, their technical helps are same with my level, except they ask me to change a new iphone, wow..
anybody in here could help or experience this?

anyone can help me to solve this problem?

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