Questions tagged [power]

The electricity drained by a device

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7
votes
1answer
11k 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?
0
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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
votes
1answer
6k 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
vote
1answer
366 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
votes
2answers
20k 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
vote
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
132 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
vote
1answer
272 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
votes
1answer
185 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. ...
2
votes
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
vote
2answers
529 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 ...
14
votes
4answers
23k 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
votes
1answer
42k 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
votes
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
70 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
vote
1answer
307 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
votes
1answer
89 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
votes
4answers
1k 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
407 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
votes
3answers
638 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
6k 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
votes
0answers
219 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
votes
0answers
134 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
vote
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
719 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
136 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
767 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
vote
0answers
50 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
582 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
201 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
3k 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,...
46
votes
6answers
23k 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
624 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
3k 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
1k 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 ...
4
votes
1answer
3k views

MacBook Charging Wattage

I have 2015 rMBP and its hooked to a thunderbolt display and uses it's power cord for charging. I noticed that the charging wattage is really low(~2W) compared to what I see when using the MagSafe 2 ...
1
vote
1answer
35 views

2011 MBA occasionally drains battery and powers down even when powered

Sometimes I leave my MacBook running (connected to the charger) and when I return it has drained the battery to 0% and powered off. This has been happening sporadically for over a year, but seems to ...
2
votes
2answers
2k views

What happens to a MacBook's battery once it reaches the maximum cycle count?

I have a MacBook Pro and according to Apple, its cycle count limit is 1000. What happens when it surpasses 1000 cycles? Will the battery continue working or not? Will the MacBook still be able to ...
1
vote
1answer
8k views

macbook pro mid 2012 won't start

I bought a secondhand macbook pro mid 2012 without retina and it has faulty battery. So I have to use 3 pin adapter. Yesterday, it was okay (able to turn on, browse internet) yesterday and when I ...
6
votes
1answer
2k views

Should I be concerned if my charger is earthed (grounded) or not?

Depending on when you bought your Macbook and from whom you will either get a 2 prong duckhead connector or a 3 prong grounded connector. I noticed the three-prong grounded connector is well grounded....
1
vote
1answer
831 views

Trackpad on MacBook Pro 8,2 (15'' early 2011) goes crazy on power

Whenever I connect the AC power cord the trackpad behaves erratically. If I disconnect the computer sometimes returns to normal, sometimes not. Some background: My computer is originally from the ...
3
votes
1answer
3k views

Capacitor discharge for replacing broken iMac power supply

A friend has offered to give me an iMac (either 2009 0r 2012 model but I haven't seen it close up yet). It works, other than a broken power supply. This ifixit page details the power supply ...
1
vote
0answers
312 views

What API does iStat Menu use? (Mac power system sensors)

I am writing a script to procedurally measure certain power system parameters. I am aware of system_profiler SPPowerDataType. However, this API only updates once a minute and sometimes provides ...
11
votes
1answer
131 views

How can I find out which USB Type C port is supplying power

I have a MacBook Pro 15" Late 2016 with USB-C ports. I also have a LG 27UD88 monitor that can supply 60W, and a CallDigit Dock that can supply 90 W. But still sometimes the MacBook is at 0% battery, ...
1
vote
1answer
3k views

Danger of damaging 13" macbook pro by charging it with 85w charger? [duplicate]

We've got a range of laptops in our office all macbook pros some of which are 13" and some of which are 15". The 15" laptops came with 85w chargers, and the 13" came with 60w chargers. I want to ...
0
votes
1answer
803 views

Samsung SSD Firmware Update Power Cycle on MBP

I am trying to install the firmware update for my Samsung 840 Series (250GB) on my MacBook Pro 13" (early 2011). As explained in Samsung's installation guide I downloaded the respective .iso file and ...
7
votes
5answers
5k views

Can you daisy chain 2 Macbook Pro's onto a single power pack?

Can I feed another MBP by USB-C cable from a port on the first laptop? Power packs can deliver 1.5A (at 220V = 330W) over USB-C to the MBP. MBP power requirement is 4.3A (@ 20.2V = 87W). So seems the ...
5
votes
2answers
613 views

Do monitors and other peripherals - with their own power source - drain power from MacBook when plugged in via USB-C?

I have 2 monitors plugged into my MacBook Pro 2016, one via USB-C and another through a 5-port hub with HDMI. When the MacBook is not plugged in to power (through the hub) it seems to drain power very ...
0
votes
1answer
177 views

MacBook Pro Power Supply Options

We seem to have a lot of problems with genuine Apple power supplies for our MacBooks failing at the spot where the cable enters the case. So I've got some questions: Suggestions for best practices ...