If we unplug the power adapter, the battery has nothing to supply so the computer shuts off. (Coincidentally, I have a MBP with the exact same symptoms you have, so the output here works perfectly!) The key here is that under "Amperage" we get a "0" which means there is literally no current coming from the battery (Note: even though it may have voltage, if there are no amps, it won't have the "power" to supply).
Here we can see that the battery is in need of service. You can limit it to just the battery info by tweaking the command as follows: $ system_profiler SPPowerDataType | grep -i "charge information" -A 10 The output can be rather lengthy the info you need will be at the top. That will give you all the power settings related to your Mac. Using Terminal, just issue the command: $ system_profiler SPPowerDataType These are all good, but in my opinion, I would much rather use built in tools to get this info. There are a number of utilities that you can get (paid and free) that will look at your battery status: If it's necessary to have the power adapter plugged in when trying to turn it on, it's a sure sign that the battery is discharged. And plug in charger when battery reaches 20% to 30%.The computer (in this case your MacBook Air) turns off because there is no more/not enough charge in the battery.
Replacement Part Numbers: For Apple A1435 A1466 A1465 Compatible Models： MacBook Pro A1435 MacBook Pro A1425 MacBook Pro A1502 MacBook Pro "Core i5" 2.5 13" Retina MacBook Pro "Core i7" 2.9 13" Retina MacBook Pro "Core i5" 2.6 13" Retina 2013 MacBook Pro "Core i7" 3.0 13" Retina 2013 Macbook Air 11'' A1465 2012 Macbook Air 13'' A1466 2012 MacBook Pro (Retina, 13-inch, Early 2015) MacBook Pro (Retina, 13-inch, Mid 2014) MacBook Pro (Retina, 13-inch, Late 2013) MacBook Pro (Retina, 13-inch, Early 2013) MacBook Pro (Retina, 13-inch, Late 2012) Proper Charger Usage New charger’s output current will be compatible if equal or greater than your old charger Compatible Laptop Cat5e Outdoor/ Waterproof Ethernet CableĦ0W MagSafe2 AC power adapter charger, for MacBook Air 13” in 2012- 2015 *Please double check your old charger’s tip size and output voltage.Other SSD adapters For less common SSDs and SSD slots.plugging into USB port For plugging other SSDs into USB ports.SSD adapter for USB For plugging other SSDs into USB ports.plugging into mSATA slot For plugging other SSDs into mSATA slots.converting mSATA SSD For converting mSATA SSDs into another connector.plugging into PCI-e slot For plugging other SSDs into PCI-e slots.SEE ALL For plugging other SSDs into PCI-e slots.SSD adapter for PCI-e For plugging other SSDs into PCI-e slots.plugging into M.2 slot For plugging other SSDs into M.2 slots.converting M.2 SSD For converting M.2 SSDs into another connector.plugging into SATA slot For plugging other SSDs into SATA slots.SSD adapter for SATA For plugging other SSDs into SATA slots.plugging into Apple Macs For plugging other SSDs into Apple MacBooks/ iMacs.converting Apple SSD For converting Apple SSDs into another connector.
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