Iphone 4 battery dying very quickly

About a couple of weeks ago the battery on by iPhone 4 started to die really quickly, not when it's in use as much but when it's locked? So I bought a battery and replaced it. I've checked all the settings e.g. Brightness, location services and all seems in working order.
-The iPhone is out of warranty.
Please Help ME!

Added (1). Can people only leave serious answers, I like my iPhone I don't want telling to get another brand that's not helping a bit.

So sorry thats happening! I think you need to buy a new phone

Try to clean the contacts where the plug goes in (gently!) It sounds like corrosion.

Basically your apps and internet are probably draining the battery. To help keep it on for longer, keep the screen brightness low, and only turn on Wi-Fi and bluetooth when you are using it.

hope this helps!

Basically your apps and internet are probably draining the battery. To help keep it on for longer, keep the screen brightness low, and only turn on Wi-Fi and bluetooth when you are using it.sometimes the brightness of the iphone drains some of the battery so you might want to dim it.

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