I'll give you the TL;DR version of what you could've found by searching: 9 hours is achievable if your usage ressembles Apple's testing method, which is explained in the fine print on Apple.com.
This is my review of the 2020 MacBook Air. I got the i7 / 16gb / 512mb combination as that shipped the fastest. My first Mac I ever had was a 2011 MacBook Air and I really liked that machine, it was priced fairly and was an easy jump from a 2006 Inspiron I had before that. Eventually I really wanted the Retina display, so I issued myself a 2016 MacBook
This is how Apple tests to get their battery life figures (it's a footnote on the product page): Wireless web testing conducted by Apple in October 2011 using preproduction 2.8GHz dual-core Intel Core i7–based 13-inch MacBook Pro units, preproduction 2.4GHz quad-core Intel Core i7–based 15-inch MacBook Pro units, and preproduction 2.4GHz quad-core Intel Core i7–based 17-inch MacBook Pro
The 2023 is (to state the bleeding obvious) better in every single way, but for an eight year old machine the 2015 MacBook stands up pretty well. It’s a solid machine, loads of ports, MagSafe, good keyboard, good screen. If you can get a good deal on one, and it’s had the battery replaced and that’s in good health, you’d be good to run
Performance and battery life. OS X benchmarks Geekbench Xbench Battery life; 13-inch MacBook Pro with Retina display (early 2015, 2.7GHz Core i5, Intel Iris 6100) 6,293 (32-bit) / 7,062 (64-bit) 487:
I recently bought a MacBook Pro, and I installed Windows 8.1 with bootcamp on it. However, the battery life is absolutely horrible. I get about 2 hours of battery life doing light tasks that would get me 8-9 hours of battery life on OS X. Task manager shows minimal CPU usage, like
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macbook pro early 2015 battery life
