Macbook Retina (early 2015) 12 inch battery life I have owned this laptop since January 2016 and the battery has done 340 cycles in about 2.5 years. The battery originally lasted at least 9 hrs, hardly drained in sleep mode.

It is important to note that while the 15-inch ‌MacBook Air‌ has a battery that is 13.9-watt-hours larger than the 13-inch model, both machines have the same 18-hour battery life.

Apple claims that the new MacBook Air will get up to 15 hours of battery life when web browsing and up to 18 hours when playing video. Third-party tests have found similar results. Laptop Mag found that the new MacBook Air lasted for 11 hours and 6 minutes on their web surfing battery test, which is a hair under Apple’s claim but still very good.
The 15-inch MacBook Air starts at $1,300 for the base M2 processor with eight CPU cores and 10 GPU cores, along with 8GB of Unified Memory and 256GB of Storage. That’s $200 more than the base 13
The M2 chip's efficiency is on full-display when it comes to battery life. On our test, the 15-inch MacBook Air lasted 14 hours and 48 minutes while streaming video, browsing websites, and running Officially, Apple reported that the original MacBook Air provided five hours of battery life "with wireless activated". This is a rather remarkable claim, as Apple more modestly stated that the "regular" MacBook models available at the time could provide "up to six hours" of battery life, but acknowledged that it was "up to 2.5 hours of DVD
Tips: How to Improve MacBook Battery Life. There have been complaints about MacBook battery running out quickly on macOS 10.15 after its beta release. Here are some of the most productive tips to prevent the battery from draining fast after upgrading to macOS 10.15: 1. Turn on Energy-Saving Mode. If you can save energy, you can save Power.
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