Why is my iphone 5s dying so quickly?

I have had my iPhone 5s for almost a year now. I have not had any problems with it until last Saturday (it is now Thursday). It is charging really slow compared to usual, and dying really fast. I don't understand why it would suddenly do this, rather than slowly decrease. Please help? Also, I won't restart my phone, and I have already cleaned the charging port multiple times. It's not my cord, because I have tried multiple cords. I've been looking online and have been unsuccessful at solving the problem. Is it my battery? Do I need a new one?

Your battery is dieing most likely, that or you have done somthing to brightness, usage, etc… Bluetooth and 4g/3g can lower battery faster as well

Take to apple

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