Why does my battery having so many issues now?

[onecooldude123]

So, i have a samsung galaxy exhibit. I've had it since July 2014. I've had no issues until tuesday. First issue that arose on tuesday was that my charger only worked in a certain position. I didnt mind this too much. Then, tuesday night i turned it off, plugged the charger in and slept. when i woke up thursday morning, i had 72% battery despite having a 100 at 3 am or so, it lost 28% in 3 hours when i woke up at 6 am. Then i turned it off until i got home from school around 4 and charged it in the required position and it charges to 100 and stays at 100 while turned o. Thursday night, when it was at 100% charge, i turned it completely off. I woke up, and it lost 25% battery power while turned off. Whats going on here? is my battery screwed or is it my phone itself?

 

[onecooldude123]

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