In my opinion, x86 processors generally suffers a steep performance penalty when running on battery. Based on my experience with the M1 MacBook Air, nothing comes close to its battery life at the same price point. The reality is that it runs ARM cores that is unlikely to match high powered chips from AMD or Intel when it comes to pure CPU performance. But it runs basic and specific use cases more efficiently than any x86 processors. For example, when I first used the M1 MBA, basic usage like surfing net and streaming YouTube videos only managed to deplete 3% battery after 2 hours. I also used it for work, using a dual screen setup while running on battery. At the end of 9 hours, it's still got more than 40% battery. So yes, it's slower than my laptop with a R7 5800H in terms of raw processing power, but it is not like its crawling. In fact, it's fast and responsive. The flipside is the soldered RAM and storage which is annoying. I opted for a 512GB version, but would be nice if I can increase the storage on my own. But Apple's being Apple. So nothing new.