Why does my iphone 4 battery drain so fast?

So I'm currently using the iphone 4 and I have turned off 3G and everything that drains my battery and it doesn't drain much overnight (only 2%), but when I'm using Wi-Fi it just drains like crazy…10% for 20mins.is that normal? I have tried to drain it completely to improve my battery life as I heard it helps. But is it normal to drain so fast over Wi-Fi? If not then how do I fix it?

Try restoring it,

If not
It's happened,
Since the iPhone 4 was released in 2010, 5 years ago. It is becoming old
Take it to a local repair shop and get a new battery
Or take it to Apple to do
Usually a new battery will fix this issue

It's really old. The average cell phone life is 4 years ish, and that's how long the iPhone 4 has been out. They put a set life span on it to force you into getting a new phone.

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