IPhone 4 Battery Issue! Any

Well, i have just bought iphone 4 running ios 6.1.3, everything works fine its fast and no lag but when it comes to battery its really awful i get about only 3 hours of usage (games, apps, internet,) and almost a day standby and thats very low in normal cases it should have about 7 hours of usage and a 2 days if not 3 of standby i also noticed that it gets warm when i play games specially if they were 3d games? So any help? Even though i have turned many things off…

Added (1). But i read on google that this is caused by the ios 6 it self (as it even caused battery drain in the iphone 4s and 5) and i can't afford upgrading or replacing. So should i wait for ios update (ios 6.1.4?)

Get it replaced.

Bro… Your phone battey has gone, and you better to change it other wise it will harm its motherboard.

You can't replace it, using iphone in 3hours without stop playing and browsing causes heat and short usage of battery. All you have to do is minimize using your iphone in playing games, then set your brightness of the screen make it a little bit darker to reduce short usage of battery.

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