IPhone 4 battery dying very quickly?

Hi, I have an iPhone 4 and the battery has been dying quickly. For example, it'll be 100%, ill be on it for 15 min, and it'll be at 85%. Ik that you have to close the apps at the bottom, I do that every couple hours. Also, I have a decent amount of memory on my phone (1.3 GB out of 5 GB) and I turned off icloud for most of my apps just kept it on for pictures and a few apps. I have about 1300 pictures, and not alot of apps. This has only been happening recently, maybe the past week or so. I'm not imagining it, it'll die like 10% in 10 min or so which isn't normal.

If playing games constantly then thats screen power and processor so that can use alot of battery, although I would think it would be more like 25% an hour, not as much as yours states.

If you use Wi-Fi turn it off when you don't need it also don't keep it on the charger longer than it needs to be lije when it says full take it off don't leave it. This is what happened to my phone

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