Laptop recommendation for a cs student under $600 or in India 50,000 INR

Well i started my B tech course this year, I am looking for a laptop for my use case. I am using linux as a main os for 3 years.

The laptop which i currently use is a Dell Inspiron N5110. Its a pretty old machine so i am currently looking for an upgrade.

Things which I do :

1. Read documents
2. Watch videos and listen to music
3. Light coding
4. Tinker with almost everything
5. Try new software if i can.

I REALLY need a a laptop with good cooling and battery life like 5 hours is fine.