Tablet suggestions for under 300$s

i am looking for a tablet under 300 dollars..

what i want it to do/have :

1) ultra long battery. i wanna watch youtube videos and play games for longs hours..so only want tablets with a big battery

2) not crappy build quality

3)value for money

what i dont care about / dont want:

1) the os .. i am fine with android (4.1 + though) windows 8 pro or rt ..

2) 2nd hand / refurbished : so no ipad pls crosses my budget

3) size - can range from 7-12 inches

BUT the main thing i need is battery ..so pls tell me the options available for me?

ps does n10 offer better battery than new n7?