Laptops that Offer Long Battery Life?

I'm looking for a laptop that can handle long hours of usage, lasting a full day (9:30 AM - 6:00 PM) without charging.

I travel often, so I need a lightweight and portable device. During these hours, I’ll be multitasking with office work, including Word documents (150+ pages) without lag and managing PDFs and media files. I also need decent storage for my files.

Can you recommend a laptop that meets these needs without being overpriced?