How is the 2700mAh battery for this phone?

I'm buying a new Nexus when it's released in a couple months. I just don't know which yet. Sailfish has a 2770mAh but the Marlin is going to have a 3450mAh. Battery is huge for me but price is also a factor. So I wanted to know how well does the Nexus 5x with a 2700mAh?