My iphone 4 charges very slow and dies very fast?

Hi, I only noticed this a few days ago, I had it on charge for about an hour and it only went up to 20% and yesterday I had it on 39% and I quickly popped shops, 15 minutes later I looked at my phone and it was on 5%. I really don't understand why, I always let my battery run down before charging it to the max, I haven't downloaded anything recently. Normally aswell, as everyone knows when the battery is completely dead and you charge it, it turns on within 5 minutes and it has a little bit of power. Mine don't, it takes half hour to switch on and is only on 4%?

The battery is probably old. Try not to use it while it's charging, and if you feel it getting hot just stop using it until it cools down.

Maybe the charger is bad. Maybe the battery is bad. Maybe the motherboard of the phone is bad.

If your phone is jailbroke that could be one reason. Also if you where jailbroken on iOS 6 and saved your blobs, you could downgrade to ios 6 and that would speed it up because iphone 4's aren't strong enough and shouldn't run ios 7 anyway (stupid apple) also you should look into getting your battery replaced it's the second easiest thing to replace on the jphone

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