which laptop

I need a laptop of aroud 35,000 to 45,000 rs.

Specs-
i5-3 generation
500 gb/ 4 GB or higher
want a free dos system (windows not required)

Likes: acer, samsung, Lenovo, Hp
Dislike: Dell, Sony

battery is the key issue i want a back up of at least 5-6 hours.


Graphics card not necessary but if present then good..