Questions tagged [power]

The electricity drained by a device

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1answer
100 views

After heavy use, my big iPad has charged very slowly. What can I do besides the Genius Bar? Is there a different wall charger I should use?

During an inpatient stay, I had my 12.9” iPad Pro(Model A1652 EMC 2827), which I tried to use much of the time I was awake. The battery was depleted most of the time: I had it plugged into a wall ...
6
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1answer
4k views

Double sound notification when plugging in iPhone X with Fast Charge

I recently purchased an iPhone X, and along with it I also purchased a 29W USB-C Power Adapter and a USB-C—Lightning cable. This setup is supposed to enable Fast Charging of the iPhone X. However, ...
5
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0answers
1k views

Iphone 6+ USB disconnects from Macbook Pro constantly over and over

My iPhone keeps disconnecting from my MacBook Pro; in fact any iPhone I try to connect (and with different cables) can never connect to it. I am very familiar with command line and Linux so please if ...
7
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1answer
544 views

How to select power direction over USB-C

I have a USB battery which has a USB-C port on it. When I connect it to my MacBook Pro (regardless of whether the MacBook Pro is running off its battery or via the mains), the Mac doesn't charge the ...
1
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1answer
22 views

Phone data security when plugged in to hotel power supply

is it true that only Apple chargers are secure from data theft from your phone through electrical systems such as in a hotel or coffee shop? I was told that you should never use a non-Apple phone or ...
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0answers
64 views

Weird Linux and/or MagSafe charger glitch

This is... confusing to say the least. A few months ago, the battery in my 2010/2011 MacBook Pro completely died, complete with a Permanent Failure Flag. Today, I replaced it, and things are really ...
0
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1answer
505 views

MacBook Pro 2016 won't charge even on power adapter

I'm using the CalDigit USB-C Dock and the Mac said it is using the power adapter, but my battery is slowly draining: I did an SMC reset and reset PRAM (NVRAM) but still won't charge. Why isn't my ...
2
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2answers
1k views

Is it okay to use non-OEM USB-C cable and/or adapter for Macbook Pro?

Is there anything special about the Apple USB-C cable, other than its quality, that would prevent me from using a USB-C cable from another brand? And the same question for the wall adapter.
1
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2answers
516 views

Macbook Power Adapter Prongs Burnt

I was travelling in China with my Macbook and USB-C Power Adapter. While plugged in at a hotel, the prongs of adapter got burnt. Is it okay to just replace the prongs, or is it likely that the ...
4
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1answer
3k views

What happens if I plug both sides of one USB-C cable from one MBP port to another of its ports?

I've got a MacBook Pro 13" 2017 - two USB-C Thunderbolt 3 ports. It came with a standard USB-C cable to support power supply. If I plug this cable into both USB-C Thunderbolt 3 ports the Mac seems to ...
2
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1answer
52 views

Wifi Problems when Notebook not connected to power source

I have a Macbook Pro 2016 that is connected to 2 external monitors via Thunerbolt. When my Macbook is not connected to power supply, I can connect to the wifi with good signal strength but loading ...
1
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1answer
215 views

Will two charging cables charge my laptop twice as quickly? [duplicate]

Now that the MacBook has all of its ports the same, is it possible to plug in two power cables into the Mac? If I do so, will it charge twice as quickly? In the event that the Mac is unable to allow ...
3
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3answers
18k views

2013 MacBook Air 13" won't boot - green MagSafe LED

I have a 2013 Macbook Air that suddenly won't boot. It was working as of yesterday. I woke up this morning and it wouldn't start. At the time, the Magsafe2 Adapter was not lit up. My wife has a ...
4
votes
2answers
96 views

How Can I Stop My Mac From Reopening Applications After A Power Failure?

I live in the woods and lose power frequently. When this happens, MacOS tries to restore every application that was open when the power went out. I don't want it to do this. How do i prevent this from ...
5
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1answer
8k views

USB type-C ports max power supply from MacBook Pro?

What are the max power supplied by Apple's touch bar MacBook Pro from its USB type-C ports?
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3answers
2k views

Extension cord or “hub” for USB-C / Thunderbolt 3

The picture below shows how my desk looks after I got my new Mac Book Pro (2017). The bright adapter is for USB, HDMI, USB-C and Ethernet. The darker adapter is from USB-C to Mini Display Port. It's ...
3
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1answer
5k views

Anker Charger 45W for Macbook Pro 15 inch 2017

I have one curious question. Currently, I'm using the Anker Powerport+ 5 ports usb-c to charge my Macbook pro 2017 15 inches. The power delivery in the system report is 45W . Is it safe for the long ...
1
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1answer
331 views

Does using a third party(non-Apple) MagSafe 45W power adaptor cause power problems with MacBookAir

I had to replace my power adaptor of 2010 version MacBookAir with a third party power adaptor (because it was cheaper) a few months down the line I am having to force wake up my MacBookAir and worried ...
9
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2answers
16k views

How to reset a magsafe charger that doesn't charge macbook pro's battery?

I have a Magsafe charger (original) that doesn't charge my MacBook Pro's battery. When it is connected, it will allow the machine to switch to power adapter mode (meaning no battery consumption) but ...
1
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3answers
1k views

Why the Graphics Card on my MacBook Pro is always on “High perf.” status?

After I've installed Nvidia Cuda Drivers the Activity Monitor show that Graphics Card is always on High Perf. status. No application that "Requires High Perf GPU" is running and the battery goes down ...
1
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0answers
128 views

MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports) - Increasing Battery Life [duplicate]

Hi How to effective Battery charge in MacBook Pro (13-inch, 2016, Two Thunderbolt 3 ports). As per my previous experience , i was using MacBook Air and i charge it 100 % and wait till drain then ...
1
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1answer
237 views

idle power consumption of MagSafe 2 45 W A1436 Power Supply

The title says it: plugged into the wall (120vac), but disconnected from the MacBook Air, how much power is consumed by the power supply?
2
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1answer
160 views

How to know which one is used when charging a MacBook Pro with usb-c from multiple power adapters?

There is this great question: What happens if you plug more than one charger in the new MacBook Pro (2016)? It doesn't tell me how to find out from which source the MacBook is charging though. ...
1
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1answer
1k views

Can a Macbook Air mid-2011 boot without any SSD installed?

I got a Macbook Air 13" mid-2011 (A1369) from a friend who disposed it years ago. He said it was "broken", and a technician told him it wasn't worth the repair. He's not an expert, and couldn't give ...
1
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2answers
451 views

Airport Time Capsule US power cord in Europe?

I have a US power cord for my AirPort Time Capsule (802.11ac 2TB), and I want to use it in Europe (specifically Norway). The power outlets here deliver 220V rather than the 120V a US power outlet ...
13
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3answers
17k views

Force “low power mode” on mac

When there is less than 5% battery left on a mac, the battery indicator goes red and system performance significantly drops - presumably in an attempt to make that remaining 5% last a little longer. ...
2
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1answer
29k views

Macbook Pro shuts down at 30% battery [duplicate]

I have a Macbook Pro from late 2011. it shuts down when the battery percentage is anywhere from 20-45%. Everything that I've been reading online says that the battery is dying and needs to be replaced,...
5
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4answers
2k views

Why would a new MacBook Pro charger fail in one month?

I've got a new MacBook Pro 15" that comes with the 87W USB-C adapter from US. I live in Turkey and I've got all my MacBooks from US with US chargers, and had no issue with them (as they are meant to ...
4
votes
1answer
68 views

Traveling to US - Do I need to step up / down for Macbook Pro (2016)

I live in the U.K. and I have a Macbook Pro (2016) which I purchased in Dubai. The power adapter works fine in U.K. / Dubai / India. I am traveling to USA next week. Do I need to buy the adapter ...
1
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1answer
274 views

Force Macbook Pro on AC mode using broken battery

I have a Macbook Pro 13" Retina (Early 2015) running 10.12.6 with a broken battery (Replace now alert) but I still couldn't find a proper battery in my region. In this case I should shut down the ...
2
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1answer
81 views

My MacBook Pro 13'' works only with 85w charger

I have a MacBook Pro 13'' mid 2014. My 60w charger stopped working yesterday (no green light, no AC charger detected in system information). However, when I tested the charger with another MacBook Pro ...
4
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4answers
906 views

Power suply Watts and charging time - Apple iphone

I understand that a device only draws as much current as it needs. So assuming the power supply and the device have the same voltage (5V), using a power supply able to provide more amperage (= more ...
3
votes
2answers
396 views

MacBook Pro 13" TouchBar 2017 won't sleep

I have a really huge problem with my Brand new MacBook Pro 13". When I close the lid and I open it after serveral hours the battery is completely empty. So the Mac obviously won't sleep and do ...
0
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3answers
535 views

MagSafe Charger not working

My MagSafe adapter stopped working 10 days ago, so I bought a replacement wire and replaced the original with this third-party wire. It worked fine until this morning. It magically stopped charging! ...
2
votes
2answers
4k views

Can a low-wattage adapter fully recharge the battery of a turned off MacBook?

MacBooks come with power adapters that provide a certain wattage (for example 87 W) required to keep the computer running and charge the battery. If used with a lower-wattage power adapter (for ...
2
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0answers
217 views

Macbook Pro 13" mid-2012 AC power turns off and on while plugged in

I have a MacBook Pro 13" Mid-2012. Charges fine. But while using it with AC power adapter, and connected to an external monitor, the AC power randomly cuts out (stops charging, cord light goes out, ...
0
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0answers
127 views

iPhone stops charging randomly after fully drained battery

I have an iPhone 7 Plus in good condition. Today it was connected to my Mac (I'm an app developer, I was debugging an app) and noticed that my iPhone wasn't charging. My app was debugging properly (...
1
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2answers
36 views

What counts as “power failure”?

The upper case of my (5,2) Macbook has stopped working so I'm not able to use the power button to turn it on. I'm currently using an external keyboard/mouse. Here's the problem- In order to tun it on, ...
2
votes
1answer
593 views

Sleep after lid close and power indicator not functioning after PRAM and SMC reset

My HDD corrupted, I reinstall macOS by using Internet Recovery and updated the macOS to Sierra and reset PRAM and SMC(to remove service battery message). Now, Power indicator does not work. Doesn't ...
0
votes
1answer
126 views

What is the power draw of the iPad Air?

I am trying to hook a dragonfly dac to my iPad Air using the lightning to USB3 camera adapter kit. When powering the camera adapter kit using a backup battery supply that outputs 5V/1000ma, the ...
4
votes
1answer
651 views

Entering hibernate mode after delay upon going to sleep mode doesn't work when using power supply

I've successfully set the MAC to enter hibernate mode after 1 minute delay upon going to sleep mode but it works only on battery power. When using power supply, the computer stays in sleep mode after ...
1
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0answers
49 views

My iPad mini from apple isn't turning on

I have a mini iPad from apple for a few years now and never once has it played up. This morning however it refused to turn on (it was working fine last night). I have been charging it almost all day ...
1
vote
1answer
531 views

2013 iMac 27" SSD Failure, Power Supply or Both?

I have a late 2013 27" iMac i7, 8GB RAM, 500GB SSD, running the laster version of Sierra 10.12.4 (I think) Two days ago I suddenly got the spinning beachball while browsing in Safari. However, after a ...
0
votes
1answer
174 views

Will an 85W power adapter fry the MBP 13" Mid 2009? [duplicate]

According to Apple, the 60W version of Magsafe is compatible with the MBP 13" Mid 2009. However, I've read that the 85W version is also compatible and leads to faster charge times. I'll keep this ...
3
votes
2answers
2k views

Can I plug my iPhone 7 directly into the 87W USB C power adapter?

I have a lightning connector to USB-C I use for programming and development. What would happen if I plugged the USB-C end into my late 2016 Mac Book Pro power supply (87 W)? *Disclaimer, I already ...
2
votes
1answer
2k views

How to disable the power management of the CPU on a MacBook Pro?

Since few days the battery of my MacBook Pro (Retina 15 inch, running macOS Sierra 10.12.4) is not working anymore. Since then, my computer performance is really bad: everything is slow and freezing,...
41
votes
6answers
18k views

Turning Power Chime Off

On new Macbook Pro, Power Chime runs. Whenever I delete from core services it comes right back. It makes a sound when plugging in your power cord even when the volume is at 0%. The solution I have ...
2
votes
1answer
563 views

same power chord for Magsafe 2 and Lightning

I have a Mac Air 13" and an iPhone 5. Is there a power cord / adapter that will work for both of them? My goal is to be able to plug one power cord into both of them.
6
votes
2answers
2k views

2016 Macbook Pro 15" In Flight Power Solutions?

I travel a lot by air and have run into a problem with my 2016 Macbook Pro 15": it draws too much power for in-seat charging on United Airlines (75 watt max). Since my journeys have me in transit up ...
2
votes
3answers
822 views

3rd party power adapter causing screen glitches?

After some rearranging my bedroom, I had to replace my US plug power adapter to a 3rd party UK plug power adapter, whenever I plug my iPad Air 2 into the 3rd party charger, the screen starts to glitch ...