My iphone battery life is draining very fast?

I have the Iphone 4 which I got in January. I got it used from apple. It was working fine but about 3 days ago the battery life began to drain faster. For example yesterday it charged all last night and the next morning by 11:00am it's at 68%

I don't have any notifications on beside text messages. My brightness is very low. What could be causing this? Is there anything I can do? Are there secrets to keeping a longer battery life? Best answer is getting 5 stars.

If your not using Wi-Fi, Bluetooth, or the airplane mode, turn those off. Surprisingly enough they waste power and with them off, it won't drain as fast. Also when your charging your phone, try to take it off the charger as soon as it reaches 100%. When your phone is charging when you're at 100%, it causes the phone to drain its life quicker. I don't know why.

Hope I helped.

The same exact thing is happening to me. I have an iphone 4 too and by 11 am today its at 67% and it only started three days ago i'm not sure what's wrong

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