Why does my galaxy tab 2 have such a short battery

I have a galaxy tab 2 7.0. And my battery only lasts for less than 3 min. I do not understand why it os doing this now. It used to last 5 hours! Now it is almost completely useless. I jusr got the thing a few months ago from Bestbuy. I have set it back to factory mode many times but there is still no luck. Does anyone know why it is doing this? Is there a way to fix it, or should I buy a new, more reliable tablet? Someoone please help me out soon. And also, the time used to type ths up, 2.5 mins. My tab 2 has went from 100 to 23%

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