Laptop Problems

I want to make my laptop HP Pavilion dv6000 battery last as long as I can before I buy another battery. What are some tips that will increase my battery’s life cycle.
I always listen to music and use it about 8 to 10 hours daily.
Should it always be connected to the power outlet and what are other tips do you suggest?
How long do laptop batteries reguarly last? I bought my laptop 15 days ago.