Battery problems with iphone 4s- won't fullt charge and doed very fast?

In the last 2 months, my iphone 4s dies rapidly. I can harly get 8 hours with it. I close my apps, and my brightness is almost down to nothing. Now, i charge my phone every night. That is probablly the second time i charge it in a day but now it gets a full charge. During the last 2 days, its full charge was 96%. I just checked usage and i'm at 21 minutes usage and 28 standby. My battery is on 89% Help i'm lost and my warranty expired. I'm pretty sure i need a new battery and thats about $80 but i'm pretty broke at the moment

All you can do is get a new battery. Or(and this probably isn't it, but) try a different charger maybe?

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