Questions tagged [power]

The electricity drained by a device

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votes
1answer
2k 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 ...
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1answer
34 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 ...
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2answers
1k 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 ...
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1answer
6k 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
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1answer
1k 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....
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1answer
761 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
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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 ...
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0answers
262 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
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1answer
126 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, ...
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1answer
2k 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 ...
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1answer
719 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 ...
3
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2answers
4k 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
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2answers
543 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 ...
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1answer
172 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 ...
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0answers
19 views

How can I prevent MBP shocks without original three prong extender? [duplicate]

I no longer have the original three prong extension cord for my MBP, and am experiencing the shock issue described by many other users. I purchased a three prong travel plug and tried that, but it ...
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3answers
16k views

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

This question pertains to USB-C not MagSafe. MagSafe negotiates available power with the Dallas 1-wire protocol. USB Power Delivery (PD) is an unrelated protocol. Answers based on experience with ...
2
votes
1answer
478 views

What power is going in or out of a USB-C port? [duplicate]

How do I tell how power is moving through my MacBook Pro's USB-C ports? My shiny new MacBook Pro (15", 2016), comes with four USB-C ports. Sometimes power comes in through one of these ports, as when ...
2
votes
1answer
17k views

iPhone Dies with 80% Battery Remaining [duplicate]

My iPhone 5 runs out of power very quickly. First it was 50%. Then it was 60%, then 70%, and now 80%. At 80%, the phone will shut down like it would when the power gets to 0%. When it powers back on, ...
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3answers
1k views

iPhone SE powers on whenever moved, defective? [duplicate]

Got a new grey iPhone SE for Christmas from the Verizon store. Seems to work fine except for one issue. When the phone is off (standby), any sudden motion turns the phone on, as if the home or power ...
0
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1answer
38 views

Leaving battery in storage [duplicate]

I am going to be away from my rMBP for 2 weeks, I powered it off and left it with around 56% of battery charge, anything I should do differently / didn't do? in order to keep the battery in a good ...
2
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2answers
868 views

Is it safe to use this 60W PD charged for a late 2016 MacBook Pro 13"?

The bundle charger is 61W. This USB Type-C charger comes with Power Delivery 60W: Can I use it as an alternative for charing my MacBook Pro 13" (late 2016)?
0
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1answer
921 views

Does Chrome consume more energy(battery) versus Safari? [closed]

Does Chrome consume more energy(battery) versus Safari? I've seen reviews denoting Chrome drains the battery more than Safari. I'm comparing these browsers by myself to figure it out how much ...
3
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1answer
1k views

Mid-2011 27" iMac random reboots, GPU defective?

As the neighborhood computer repair guy, my friend gave me a broken iMac and told me that if I could fix it I could keep it. The exact details are: iMac mid-2011 27" 3.1GHz i5 1TB HDD 8GB RAM AMD ...
3
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1answer
2k views

How to prevent screen lock when MacBook AC adapter is unplugged?

I use my MacBook connected to an external monitor via HDMI with the lid closed, and plugged in to AC power (in closed clamshell mode). If I disconnect the power cord (usually happens accidentally), ...
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1answer
2k views

iPhone 5 won't turn on after screen repair

A couple of months ago, my iPhone 5 started to have lines on the screen. A common thing that some people do to diagnose that problem is to open the phone and disconnect the connectors to the screen, ...
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1answer
979 views

mac goes for sleep on screen lock [duplicate]

On screen lock mac goes to sleep impacting the downloads & etc. Is there any way I can lock the screen with password protection and not loose the connections ? OS version: EL Captain Currently
0
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1answer
73 views

How do I block power from going to usb without stopping data transfer?

I need an iPad connected to my iMac for a long time, but I don't want power going to it because leaving an iPad charged to 100% all the time ruins the life of the battery(link). I still want to allow ...
3
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3answers
826 views

Battery - Shut down or sleep an MBP

For the lifetime of a battery, is it better to shut down or sleep an Mac book Pro? Could anyone be able to explicit a full answer to this question?
0
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1answer
74 views

Recommended charger for iPhone 5?

I can see on the Apple store that the standard charger is a 12W charger. Since it "should" output 5V, I can conclude it outputs 2.4A (12W/5V=2.4A). Considering the above hypothesis correct, could ...
4
votes
4answers
42k views

What's the fastest charging power adapter for an iPhone 7 Plus?

With my previous iPhone 6 Plus, it was recommended that I use a 12W adapter and I found that (or at least convinced myself that) the phone charged faster with the 12W than with the 5W. However my ...
0
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1answer
141 views

MacBook Pro does not switch to battery

I have a MacBook Pro (15-inch, Mid 2010, MacBookPro6,2) which does not switch to battery power when the power adaptor is removed. It simply goes off. However the battery is reported as 100% charged. I ...
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3answers
46 views

What's a good solution for a couple extra hours on an 11" MacBook Air?

My son has a MacBook Air which was required for school (a). However, it sometimes comes dangerously close to running out of power near the end of the school day despite the fact that we've (I think) ...
4
votes
1answer
5k views

MagSafe LED sometimes won't light up

I have a Mid 2014 MacBook Pro with Retina Display. As of a week ago, occasionally when I plugged in the MagSafe Adapter, the LED doesn't light up. The problem is fixed by unplugging the power adapter ...
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1answer
155 views

Macbook Air charging inconsistently

I read the related entries. My Mac Air 11" from 2011 was charging intermittently when plugged in and shutting off suddenly regardless of battery charge level or adapter connection. This problem has ...
0
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1answer
133 views

Power for my US laptop in Europe

I just bought a MacBook Pro in USA. I will get it home in Greece (220V, 50Hz). What is the usual thing to do, without having to buy a whole new charger? Maybe I can find only the cable somewhere? ...
1
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1answer
130 views

Does Apple sell European connectors individually?

I recently moved from the US to Europe. I'm currently using universal adapters for connecting my US plugs to European power outlets. Many of the things which need power are Apple devices. It would be ...
0
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1answer
529 views

High CPU consumption, 33% battery, suddenly MacBook Pro Retina shuts down saying it needs to be plugged in

High CPU consumption, 33% battery, suddenly MacBook Pro Retina shuts down saying it needs to be plugged in. I plug it in and then Mac works fine and battery level is at 33%. I googled this, found ...
2
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1answer
1k views

MacBook: Force hibernation, even on AC power (not battery power)

I've found a number of hints to force a MacBook (or other) into Hibernation mode (ie. write RAM to Disk, and completely power off - so system is back in it's pre-sleep state upon next boot), but they ...
0
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1answer
4k views

Sleep/wake Mac mini by pressing power button

I have a Mac mini that is on my network but not connected to any displays or input devices. It's running El Capitan. I want to be able to put the Mac to sleep and awake it as easily as possible (i.e. ...
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1answer
2k views

How do I use a power adapter extension cable?

So I got this strange thing here: http://www.apple.com/shop/product/MK122LL/A/power-adapter-extension-cable It says that The Power Adapter Extension Cable is an AC extension cord that provides ...
1
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1answer
100 views

Power Line Adapter (PLA) network reducing Macbook Pro's battery life

I am not sure anyone has had same experience as I have. Recently bought a retina MacBook Pro and of course I was looking forward to enjoying the 10 hours of battery life that was promised. 2 months ...
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2answers
2k views

Magsafe's indicator light goes off, battery gets not charged further

Yesterday, all of a sudden, my macbook pro (15 inch early-2016) started to forget how to charge its battery. According to the battery icon, almost everything looks great but one thing. It doesn't ...
2
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2answers
2k views

Macbook Pro not responding to keyboard or power button

I bought a used Macbook pro mid 2010. The previous owner sold it to me because the computer would not power on. It turned out the magsafe charger was broken and it had run out of battery. After ...
0
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1answer
504 views

Does Mac power adapter die if you leave it plugged in?

I have recently bought a MacBook Pro 15". A couple of days ago I had charged my MacBook and left the charger to the socket and it died. When I tried running diagnostics, it showed that power adapter ...
1
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1answer
538 views

New internal hard drive not spinning on MacBook Pro A1278 13", Mid-2012

The Hitachi 5K750-500 initially installed in the MacBook A1278 13", Mid-2012 failed. I bought a new hard drive (Seagate ST500LT012) but it was not detected by the Disk Utility. I found that the hard ...
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4answers
3k views

MacBook Pro turned off and won't turn on!

I was just using my laptop normally when suddenly the whole computer just shut down. I turned it back on straight away and it was fine. Another hour passed and it did the same thing. I could also turn ...
0
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1answer
177 views

iPhone 6S (iOS 9.3.2) starts switching off whenever battery is low

So I have an iPhone 6S running iOS 9.3.2 and recently, I have observed this very annoying trend. The phone switches off automatically when the battery level is around 15-25% [It always happens in ...
8
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1answer
3k views

How does the iPhone know it's not using an Apple cable?

Sometimes when I plug a cable in to charge, the iPhone says it may not work with this device. How does it know it's not an Apple cable?
4
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1answer
857 views

Macbook Pro Power Consumption

I was wondering if it is possible first of all to get the overall power consumption for my MacBook? And if it is possible can I get this power consumption for each peripheral running (like ...
1
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2answers
11k views

Charge my Mac via USB

I have a portable power bank and I can charge devices via USB on it. Is there an adapter to change a 3 prong charger to a USB, so I can plug my Mac into my power bank? A Mac air charger that can plug ...