What are the battery life differences between the MacBook Air M4 and the MacBook Air M3

For the MacBook Air M3, Apple's official specifications indicate up to 18 hours of video playback and up to 15 hours of wireless web browsing. In practical tests, the 13-inch model typically lasts around 14 to 15 hours, depending on usage patterns such as screen brightness and task intensity[3][6][9].

The MacBook Air M4 also claims up to 18 hours of battery life, similar to the M3 model. This suggests that despite the performance improvements with the M4 chip, Apple has maintained the same battery life expectations as the M3[1][5]. The M4 chip's efficiency is likely a key factor in maintaining this level of battery life despite enhanced performance capabilities.

In summary, while both models offer excellent battery life, there is no significant difference in their battery life claims. The M4 model's performance boost does not seem to have compromised its battery life compared to the M3, maintaining Apple's reputation for balancing performance and efficiency in their laptops.