Questions tagged [power]

The electricity drained by a device

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24 views

Battery Not Charging and Light Not Showing Up Again

I just have got a Macbook Pro Retina 2014. The charger is new and 85 Watt. I have two issues. When I first connected the charger, there was 54% charge on the laptop and for only 1 second the green ...
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76 views

Is there a way to disable any key and trackpad press power on for 2018 or later MacBooks?

Oddly, 2018 or newer MacBooks by default power on when Off (a.k.a in the shutdown state) with any key-press or track-pad button press not just the power button or touch ID area as would be ...
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1answer
83 views

Can I run MacBook Pro Retina 13 inch early 2015 without a battery?

I have a swollen battery, and want to remove it while waiting for the replacement. Can I remove it and safely turn on the Mac only with the power chord?
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57 views

syspolicyd is killing my battery on a new MacBook Pro, repeatedly scanning and re-scanning my Steam library

syspolicyd is consistently using ~20% CPU and consuming lots of power. Tracing it with sudo fs_usage "$(pgrep syspolicyd)" reveals that it's repeatedly scanning the same dozen or so Steam apps in my ~...
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1answer
38 views

Isolating power supply issue to USB-C cable

Immediate Q: Is there a way to test for faults (power supply and/or data transfer) in a possibly failing USB-C cable, by plugging each end into different ports on the same machine (2018 MBP) and ...
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57 views

MacBook battery drains SIGNIFICANTLY after shut down

experts! I really hope to solve this problem as it has been drilling me for weeks now. I have a MacBook Pro 13" (2018 with Touch Bar), the A1989 model. When I shut down my Mac, the Mac shut down ...
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19 views

Early 2015 Macbook Air (A1466) Not Charging

I have searched far and wide to try and solve this issue but have had 0 luck. I have an early 2015 MacBook Air (A1466) that I've kept in great condition over the years. It's never really left my ...
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2answers
40 views

MacBook Air 10.15.2 Shuts Down on Startup, falsely indicating 0% battery [duplicate]

I have a MacBook Air, with Catalina 10.15.2. When I start it up unplugged, with a full battery, most of the time it starts up and then immediately shuts down. When I hit the power button again, it ...
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1answer
13 views

Diagnosing a MacBook that decided to stop powering. (A1342)

I have performed a series of upgrades on my MacBook 2010 (A1342). However, I dropped a screw, opened the device back up and fished it out and then closed it again. But when I then hit the power button,...
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2answers
31 views

Chosing the right charger: MacBook7,1 White A1324

I bought a used MacBook with identifier MacBook7,1, it's the white 2010 version (A1342). However, it already came with an off-brand charger and the text on it has gone washed off it seems, so I can ...
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2answers
49 views

iPhone's power button doesn't lock, shows Swipe to Power Off instead

My iPhone SE, running iOS 12.4 reached its lower battery limits and went dead. I, foolishly pressed power button and then it stayed in an Apple Logo screen → power off → Apple Logo, loop for a while ...
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10 views

Magsafe 2 charger after fully charge the charger light indicator will not light up

After the charger fully charge the MacBook, the light indicator does not change the color for orange to green, the light indicator just show nothings. However, the battery icon is showing in charging ...
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1answer
29 views

Installing more than one battery pack in Macbook?

I am interested in installing two standards aftermarket batteries (wired in parallel) in Macbook 11 inch 2017. Please ignore the issues with the physical housing constraints - I am purely interested ...
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241 views

macOS Catalina drained my Macbook Pro's battery while in sleep mode

Yesterday I updated to macOS Catalina on my Macbook Pro 13" (i7, 16GB) and something strange has happened. Normally, the way I use the computer is to be attached to a double monitor setup, with the ...
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1answer
25 views

Is there a power bank that would work properly on MacBook Pro (15-inch, 2019)?

Is there a power bank that would work properly on MacBook Pro (15-inch, 2019) ?
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2answers
65 views

Mac mini not autobooting after “dirty” shutdown

This Mac mini is intended to run as a kiosk, but a daily sleep/wake cycle is proving problematic with some USB devices. My plan was to use the "dirty" shutdown from the commands line to simulate a ...
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1answer
32 views

How can I charge my MacBook Pro and not block one thunderbolt 3 port for other uses?

I record high school bands when they go to contest using Sound Studio. Each of three judges is also making digital recordings on hand held recorders. While I am recording one band through a mixer ...
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28 views

Laptop charger getting very hot

The charger for my Macbook Air is getting very hot, to the point where it is painful to the touch. I have tried swapping out a different charger and it is also gets very hot, so I don't think it is a ...
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16 views

How to prevent Macbook Air from going to sleep after disconnecting power cord?

I have an annoying issue with my MacBook Air (13-inch, Early 2014 on macOS High Sierra Version 10.13.6): A few minutes after disconnecting the power cord from my fully charged laptop, it goes to sleep....
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26 views

Macbook Pro 2018 (15-inch) Android Studio Energy Impact

Has anyone else experienced Android Studio's 'Energy Impact' in Activity Monitor exceed 100.0? I just noticed that the fan was making an unusually loud noise and took a look at the Activity Monitor. ...
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1answer
54 views

Will my iPad get damaged if I connect it to a 18W power bank instead of the 10W charger in the box? [duplicate]

I just bought a 6th generation iPad 2018 and was given a 10W charger along with it. I was wondering if I could use an 18W power bank to charge it. Will it damage my iPad?
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22 views

MBP won't turn on/wake up

I have a 2011 MBP that I can't get to "turn on". I had it open and running normally about a week ago. Since then, it's been on my desk with lid closed (presumably hibernating). I opened it yesterday ...
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1answer
34 views

How can I tell if my computer is on?

I've got a late 2015 iMac with a Bluetooth keyboard and mouse. As part of the minimalist design, Apple appears to have eliminated all the indicator lights. If the screen is black and the computer ...
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1answer
25 views

Can I check power usage of my macbook?

A while back my Macbook Pro battery started acting up. Now I pretty much have to have it plugged in all the time otherwise it'll turn off. Also, I am getting (replace soon) battery status. I'll change ...
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1answer
558 views

What are these “Power Events:” > “Next Scheduled Events:” that are showing up in my macOS system information?

I am running macOS Catalina Public Beta 9 (10.15, 19A573a) on my MacBook Air (2019) and noticed these — at least to my eyes — odd entries under “Hardware > Power” when looking at system information. ...
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1answer
85 views

2019 MacBook Air still sucks down battery when sleep

Apples website says my 2019 MacBook Air has 30 day standby time and runs 12 hours on battery. My 2015 MacBook air (my first mac) actually got around 12 hours battery while using node, chrome, and ...
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1answer
128 views

Can a lightning cable plug get short circuited by a metal surface?

I have a couple of lightning connectors on a flat surface, ready to plug into an iPhone or iPad for charging. At the same time, a Macbook or iPad is sometimes placed near that surface. Can the body ...
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3answers
278 views

How do I fix “Battery is not charging” for 2012 macbook pro retina?

I have a Macbook Pro, and it's battery is not charging. If I switch off the power adapter, the computer instantly switches off. No shut down sequence. I have to plug in the power adapter to switch ...
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1answer
380 views

Macbook Pro 15 inch 2019: will charging from LG 38WK95C-W via USB-C damage/fry the macbook's battery?

I just received a new 15 inch macbook pro (2019). I connected it to my external monitor LG 38WK95C-W via the monitor's provided USB-C cable. It does video/data transfer however since it is a usb-c ...
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1answer
361 views

Macbook Pro 2018 battery not charging dodocool 7-in-1 hub suspected

I am having a version of the battery not charging issue on my Macbook Pro 2018 (13-inch, Four Thunderbolt 3 Ports). The symptoms are somewhat different from related issues, such as in this post. I am ...
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0answers
68 views

New Macbook suddenly shut down when using Virtual Box

My MacBook Pro 2019 suddenly powered off when I was booting ubuntu on virtual box. The only other program running on my laptop was the App Store. How can I find out the reason of power failure? It's ...
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1answer
46 views

Why does my 2017 iMac work in every building except my office building?

I moved my iMac from home into my office and it would not turn on at all there. So I took it around the corner to a repair man and it turned on straight away at his shop. He suggested I get a UPS to ...
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1answer
29 views

How can I check if my MacBook Pro is shut down without turning it back on?

Sometimes I like to shut down my Macbook Pro (e.g. if I know I won't be using it for some time and I want to save battery). Unfortuantely, I can't figure out any way to actually check that it's shut ...
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1answer
399 views

Does the Mac mini (2018) deliver power over Thunderbolt ports?

Thunderbolt ports can optionally provide power, up to 100 watts. Does the Mac mini (2018) provide any power over any of its four Thunderbolt ports? If so, how many watts? On which of the 4 ports? ...
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2answers
295 views

MagSafe: Where is the charger ID stored?

I'm about to change my power adapter's cable due to the classic cable fraying. However, according to this, there's data that gets passed around using the 1-Wire protocol. I only see 2 wires on there....
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1answer
31 views

Charging suddenly stop when I try to use the device

It's my first time with a mac computer, I have a macbook pro 2011 . The problem , charger works fine when the laptop is closed or idle, when I start using it like for example opening Finder, simply ...
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2answers
56 views

How can I charge my MacBook Pro at work?

I have a 15" 2019 MBP and want to be able to charge it at work without carrying my adapter and cable back and forth. At work I have a Dell OptiPlex 7050 and two Dell monitors (one is HDMI, the other ...
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2answers
221 views

What is the voltage output of an Apple 85W MagSafe 2 model A1424 without a load?

I’m looking to understand how to test and evaluate chargers so this is a bit technical a problem. Since MagSafe is proprietary, I can’t consult a USB power distribution specification to know how ...
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1answer
38 views

How can I ground this charger

This charger came with my MacBbook Pro which I bought from India. The other end is connected to the magsafe adapter's ground pin. What do I need to insert here?
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91 views

Macbook Air Mid 2012 A1466 Power button not working

Thanks for stopping by. As the title states, when I press the power button on the keyboard, nothing happens. This is a ongoing problem I've had for a couple months now and it's starting to get on my ...
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1answer
69 views

What input voltages does the 85W Magsafe 2 power adapter accept?

I have an 85W Magsafe 2 (A1242, MD506LL) power adapter which has been happily driving my MacBook Pro from US and Canadian 110V AC power. I am about to take this power adapter to Europe. Will I be able ...
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2answers
519 views

Is there a USB-C PoE adapter for iPad Pro?

Is there a dongle which plugs into the USB-C port on the iPad Pro that accepts Power over Ethernet (PoE) so when PoE is available there’s no need to plug an additional USB-C cable to provide power to ...
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0answers
58 views

MacBook Pro late 2013 (Model: A1502) won't boot or respond to any Input

I have a big problem with my MacBook Pro late 2013 it does not boot or light up in any way. Current behavior The only reaction that I get is, when I connect it to the powercord and start with the ...
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0answers
35 views

Is there a way to easily test the speed and power capacity of a USB-C cable?

Specifically in a macOS / iOS household (i.e. not looking for solutions that calls for Windows software). I have a number from varying sources and definitely they are not equal. For example: The C-...
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2answers
67 views

What to do if MacBook Pro 2017 uses more wattage than the charger can give?

I wanted to ask, what to do if MacBook Pro 2017 uses more wattage than the charger can give? Why I am asking this or thinking this might be a problem? I tried to play some games on BootCamp (playing ...
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1answer
78 views

Disabling a specific system notification?

My Macbook Air 13" (macOS 10.13.6) has a USB problem which triggers a warning notification every five minutes: Looking in the Console, I see lots of "overcurrent detected" warnings; testing the two ...
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1answer
120 views

Macbook battery bar showing as red; battery % jumps around; battery condition normal; out of US charging

I've been in Europe since 7/5. I've been charging my 2015 macbook pro (purchased in the US) in the UK from 7/5-7/11 and in Italy from 7/11-current. I use a power adapter (not a converter) since the US ...
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1answer
132 views

What do the various USB 'current' labels under macOS System Report mean?

Could someone please clarify what the following values under System Report > USB mean. I am using an iMac 5K 2019 Current Available Current Required Extra Operating Current Sleep current Also, what ...
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76 views

Lightning cable pitted contacts fix?

Lightning cables are expensive, and I have 2 of them which are in great shape except that they are failing because of pitted contacts. That is, the gold metal of one of the 8 leads has been removed, ...
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0answers
65 views

Standard charger for Macbook Pro insufficient [duplicate]

I recently bought a MacBook Pro (15-inch, 2018) and I am using the OOTB Power Adaptor (87W) and USB-C cable. I am finding that when I run computationally expensive processes (e.g. I utilize multiple ...