5 Will running my MacBook Air while plugged in improve its battery life? I usually charge my MacBook Air to above 90% and then use it unplugged until it drains to 25-35% levels. Make better choices about where and what to source from China. Damian Claassens Answered November 29, 2017 Short answer with caveats, is yes.
My new Macbook Air(M1 Chip, Big Sur 11.1) uses a lot of the battery during sleep mode. As you can see screen usage is zero during night but buttery usage is hight. For example if my Macbook steel in sleep mode for two days then I can not start my Mac without connection to charger since battery goes to zero.
Battery: MacBook Air 11” 2015: MacBook Air 13” 2015: Size: 38 Wh lithium‑polymer battery: 54 Wh lithium‑polymer battery: Battery Life: Up to 9 hours of wireless web; Up to 10 hours of iTunes movie playback; Up to 30 days of standby time; Up to 12 hours wireless web; Up to 12 hours of iTunes movie playback; Up to 30 days standby time

Light Web Browsing Battery Life 13-inch MacBook Air (Mid 2011) - Core i5 2.7GHz This message will self-destruct after reading. Anand Lal Shimpi - Thursday, July 28, 2011 - link Fixed :)

We praised its “killer battery life” in our review, but that reflected weeks of intense testing, not months. MacBook (2015 or newer) MacBook Air (2012 or newer) MacBook Pro (2012 or newer
Got exactly the same deal (Early 2015 macbook pro 15" with 16gb ram and the I7) from my office. Bought it for 100 bucks, cleaned the anti-reflective layer off of the display, got a new battery with tools for another 100 and use it as my personal laptop without an issue.
3oOFnW.
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