Charge iPhone 4S overnight and it drops to 1% and won't charge?

The past few days my battery life on my iPhone 4S has been awful, it lasts about 15 minutes on a "full charge" and if I turn it off it won't turn back on until I put it in the charger. I put it on the charger last night when it was about 15% and woke up to 1% and still charging. I reset it and put it on the charger and it's been on 1% for 20 minutes now. Any solution or do I need a new phone? I've tried some if the possible solutions involving iCloud and the new update but they havnt worked so far.

Time for a new battery.

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