Dell Inspiron 8600 laptop is too dark outside the house

[sxb]

I love my new Dell Inspiron 8600 laptop for 4-tabling on Party. The only problem I have is that the screen is too dark for me to see clearly when I'm using it on battery outside of my house. Is there any way for me to change the setting so that when on battery the screen is as bright as when connected to the power outlet.