iphone battery draning fastly

[George]

My friend update his iphone 3gs from ios 4 to ios 6.1.3 , the problem he is facing now is that his phones battery drains very quickly..he even don't use and the battery dies, what has happend to the mobile can anyone help?

 

[vaibhav25]

just give your iphone for servicing and get it checked up .

 

[NicholasK]

You have to downgrade your iPhone as iOS 6 using too much battery which iPhone 3G is not have.

 

[sarakfeely]

Turn of all unnecessary apps , location services , search feature