How much better performance can I get using an Nvidia GT 920M instead of an integrated Intel HD 5500

I’m planning to buy a new laptop: Lenovo comes with a dedicated GPU for 100€ more than the Dell one, how much worth is that? I’d like a great battery life.

Wrong forum

You should keep topics game dev or unity related. But dedicated does not give you more battery life. It doesn’t make a difference, it’s there for performance (and may reduce battery life, if you use it a lot).