Picked up a refurb 16GB air just last week. I'm astounded at the battery life. It's my dream laptop. I wanted to buy a framework for the repairability, but I make some iOS apps and also really wanted the battery life. I've been floored by how long it lasts, even running npm installs and compiling Angular applications, things that used to burn my lap and drain the battery in 4-6 hours on my Intel air.