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90 votes
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Turning Power Chime Off

The solution is to set ChimeOnNoHardware to true instead of setting ChimeOnAllHardware to false (note, No instead of All): defaults write com.apple.PowerChime ChimeOnNoHardware -bool true killall ...
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58 votes

Can I use 45/60/85W MagSafe era MacBook chargers interchangeably?

There is a lot of misinformation in some answers. I will give some facts along with my reasoning. All MagSafe adapters, when plugged into a mechanically matching receptacle on a MacBook/MacBook Pro, ...
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53 votes
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Use caffeinate to prevent sleep on lid close on battery

It's not ideal, but here's a solution. To prevent the laptop from sleeping when the lid is closed and you're running on battery, run the following commands: sudo pmset -b sleep 0; sudo pmset -b ...
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29 votes
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Is it necessary to shutdown and unplug the power cord of Mac Mini every night?

While there are many opinions on what you should do and when you should do it there is no technical reason why you need to unplug your Mac when shutting it down at night. In fact you don't even need ...
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24 votes

iPhone SE powers on whenever moved, defective?

The iOS 10 update brought the new Raise to wake function to the iPhone 6S, 7, and SE. It's completely normal but can be annoying at times. You can disable it from Settings -> Display & Brightness -...
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24 votes
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Can I tell my Mac to charge to 80% only?

Use bclm (Intel MacBook only?). Follow the instructions on github: 1. Download signed and notarized binary from [releases][2]. # Alternatively, you can also get it from homebrew or compile it manually....
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  • 1,775
21 votes
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How to reset a magsafe charger that doesn't charge macbook pro's battery?

Sounds like you got a sticking ground pin. Just plug it out when connecting to the laptop horizontally (with more force) and stick it back it horizontally as well. Usually this is due to you removing ...
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17 votes
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How does the iPhone know it's not using an Apple cable?

Apple has a program called MFi and detects if the cable has a certified chip inside. The chip just says that it's been officially 'Made For iOS.'
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  • 186
17 votes

Can I tell my Mac to charge to 80% only?

macOS 10.15.5 on a Mac notebook with Thunderbolt 3 ports has this option (even a bit smarter) embedded, see Optimised battery charging. https://support.apple.com/kb/HT211094
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  • 356
16 votes
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Can I charge a 2017 MacBook Pro with a third-party USB C power adaptor?

The USB-C plug is not the problem, but the charger is. It is underrated, so it will never manage to completely charge your battery while the Mac is in use, or supply enough when needed. With that said,...
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  • 45.4k
15 votes

How can I keep my Mac awake AND locked?

Not sure when it was first available, but on MacOS High Sierra 10.13.4 you can go to Apple (top left) > Lock Screen or press control-command-q to activate the lock screen. You should also do the ...
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  • 263
15 votes
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How to resolve my mac dying at 75% battery?

Typical life expectancy ("Maximum cycle count") is 1,000 cycles. From Apple's webpages: "Your battery is designed to retain up to 80% of its original charge capacity at its maximum ...
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  • 23k
14 votes
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Does “Prevent computer from sleeping…” remain in effect even if I close the lid?

Closing the lid will put the system to sleep, no matter what settings you employ. This is considered the equivalent of selecting “Sleep” from the Apple menu. The only way the laptop will stay awake ...
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14 votes

Is it necessary to shutdown and unplug the power cord of Mac Mini every night?

As a general rule, you don't need to unplug your computer if your electrical installation and power supply provide power which complies with standard power quality rules. However, if you have low ...
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13 votes
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Can I (or should I) use a MacBook charger on my iPhone?

Unless there is some reason to the contrary that I'm not aware of, yes, you can use your MacBook charger with your iPhone. The power adapter will only convert as much power as is drawn, and the iPhone ...
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  • 14.5k
13 votes
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Can you daisy chain 2 Macbook Pro's onto a single power pack?

Allan's answer is not correct, I was able to daisy chain my Mac. I am currently at a conference without my charger and I have daisy chained my Mac to another Mac (both USB-C 2017 Mac Book Pros). Both ...
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  • 255
13 votes
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"Battery not charging" on MacBook Pro

I found the answer to my charging problem in another question: https://apple.stackexchange.com/a/301722/41731 Please make sure to upvote the answer I linked. Short version: yank the cord forcefully ...
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13 votes
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Power a MacBook Off-Grid

I've worked as far afield as Northern Nigeria as a technologist (Infrastructure & Network Engineering), where reliable power is always an issue. Indeed, reliable energy is a problem endemic to ...
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  • 1,491
11 votes
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How do you get the Apple Watch out of Power Reserve mode?

You can bring your Apple Watch back to normal functioning mode by pressing and holding the side button, the same way that you do when you wish to power it on. This command will only work if you ...
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  • 45.4k
11 votes

MacBook Pro: Battery icon shows as charging even when not connected to power source

Welcome to AskDifferent! Try to perform a SMC reset, and possibly also a NVRAM reset. From https://support.apple.com/en-us/HT201295: The SMC is responsible for these and other low-level functions ...
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  • 7,124
10 votes

Use caffeinate to prevent sleep on lid close on battery

There's no native way to do it. Here is what I got after some searching and trials: Note: Nosleep's kernel extension failed to be loaded on High Sierra The private SPI is NOT supported by Apple ...
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  • 1,131
10 votes
Accepted

What are the consequences of using a low-wattage USB-C power supply with a MacBook Pro?

Apple partnered with LG to create a 4K monitor that outputs 60W via USB-C. Apple has mentioned full compatibility with a 13" MacBook Pro (comes with 61W power adapter) but mentioned that with a 15" ...
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  • 116
10 votes

Turning Power Chime Off

Here's another solution since the others provided don't seem to be working for you. You can create an empty AIFF file to replace the default chime. The chime audio is located here: /System/Library/...
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  • 314
9 votes

How to retrieve current wattage info on OS X?

Here's an ioreg command that prints most of the power information without 'grep'. It returns much faster than system_profiler on my machine, so probably more suitable for being scripted or run in the ...
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  • 191
9 votes
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Shut down system without superuser permission

Using pmset or any system tools to perform shutdown requires sudo. You can ask macOS to shut down from the user's account by telling System Events using AppleScript. You can run AppleScript from the ...
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  • 185k
9 votes

Keep low power mode on all the time

With ios13, you can make an automation that turns on low power mode when your phone turns it off.
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8 votes
Accepted

Is it possible to charge my MacBook Air from a powerbank?

Yes, The answer is positive. The power bank capable to charge a laptop needs to supply not only the USB standard charging port but also (or only) a DC output port, or a build-in power inverter with an ...
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8 votes

Use caffeinate to prevent sleep on lid close on battery

Github user iccir has made a very handy little free menubar app called Fermata that does exactly what you want: keeps a MacBook awake with the lid closed, and allows you to set a timeout duration. I ...
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  • 179
8 votes
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Are Macbook Pros with a rusted / corroded MagSafe port safe to operate?

The iron / ferric portions of the MagSafe port is something that will corrode when exposed to oxygen. The quality of your pictures is excellent and all are operationally normal and safe since the 5 ...
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  • 219k
7 votes

What would happen if I use a power supply with a different wattage than the system is designed for?

I am surprised that no one has noticed the attempt to power a device who's stated power requirements is "14.5 Volts DC at 3.05 Amperes" (The MacBook Air) with a 20 Volts (!!) DC 85 Watts power adapter....
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