For battery life, Apple compared a weaker Intel model (dual-core Core i3 with 1.1 GHz) with a MacBook Air M4. The total runtime was measured when playing movies in iTunes at 1080p.

I’ve also thrown the M4 MacBook Pro in there for comparison, and as you can see, the difference is barely negligible — all in a laptop that is $600 less. There was also a Geek

Here’s where things get much more interesting. The Air M4 is a great upgrade for owners of the MacBook Air M1 from 2020. Back then Apple used its classic shell design, with a chunkier bezel and smaller display. And the jump from M1 to M4 is an up to 60% performance boost.