Questions tagged [power]

The electricity drained by a device

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17
votes
3answers
18k 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
592 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, ...
8
votes
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
votes
1answer
40 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
votes
2answers
987 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
votes
1answer
949 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
votes
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
votes
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), ...
1
vote
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, ...
1
vote
1answer
1k 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
votes
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
votes
3answers
859 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
votes
1answer
81 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
44k 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
votes
1answer
145 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 ...
0
votes
3answers
49 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 ...
1
vote
1answer
160 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
votes
1answer
182 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
vote
1answer
145 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
votes
1answer
557 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
votes
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
votes
1answer
5k 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. ...
1
vote
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
vote
1answer
108 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 ...
0
votes
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
votes
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
votes
1answer
552 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
vote
1answer
571 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 ...
1
vote
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
votes
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
votes
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?
5
votes
1answer
907 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
vote
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 ...
0
votes
1answer
15k views

MacBook Air charging light stays amber and does not go green and machine does not boot or even chime

I have an 11" MacBook Air 6,1 from mid 2013 that I found discarded and had restored but now seems dead again. I got the machine with a broken screen backlight and missing SSD. I took it to the Genius ...
5
votes
1answer
3k views

Turn off USB power on OS X/Mac Mini

I have a need to turn USB power off (and on) using a script or a piece of software. Ideally it should be possible to turn each port off/on separately, but also turning power off/on from all ports at ...
1
vote
2answers
1k views

Debugging charging problem with MacBook Pro

I have a MacBook Pro (unibody late 2008 15") A few weeks ago the charger was causing hassle and eventually the connector came loose. The MacBook eventually lost power. Then, I asked my friend for ...
0
votes
1answer
133 views

What is the maximum safe current for Mac Pro PSU?

I regularly put my 2010 Mac Pro under pretty heavy usage, maxing out the 12 core CPUs and GTX Titan Black. I can monitor the voltage and current using iStat Menus, but I'm looking for a specification ...
1
vote
1answer
76 views

OK to power off Apple TV (4th gen) at the mains when not in use?

I've just given an Apple TV (4th gen) to a relative, who is in the habit of powering off the whole TV system (TV, DVD player, stereo etc) when it isn't in use. Is it OK to: remove power from the ...
1
vote
2answers
525 views

Any way to turn on the reduced power mode a macbook uses under battery power, but while plugged into a power adapter?

I have an external battery rigged up for my MBP. It goes through the magsafe adapter. The battery is about twice the capacity of the internal battery. The problem is, the macbook thinks it is ...
3
votes
1answer
1k views

iMac 27' powering off without reason

I have been the owner of an iMac 27' for the past 3 years. I have had the problem of the machine automatically powering off (for no reason at all) since almost day 1. After trying everything, ...
0
votes
2answers
5k views

At how many battery cycles should I consider replacing my battery?

My battery has become quite a pain in the neck recently, It's not lasting much more than about 2 or 3 hours and that's usually just using basic programs like chrome or pages etc. It's difficult for me ...
0
votes
1answer
93 views

MBP 2010 15" won't boot without disconnecting power and battery

My MBP 2010 will only power-up if I disconnect power and battery, and then only connect power. When I shut it down, it'll only power up again if I remove the power first for >10 seconds. I've tried ...
1
vote
1answer
13k views

MacBook Air won't power on, except I remove the battery and plug it back in (SMC reset?) - sleep works

I have a bizarre problem with my 2012 MacBook Air 13": At some point, a couple of weeks ago, it suddenly stopped turning on. The battery would charge, but pressing the power-button just wouldn't have ...
3
votes
2answers
2k views

Can I charge my battery with a higher wattage charger than what came with device

Will it hurt my battery to use a 12w charger instead of a 10w that came with my iPad Air 2. iPhone charger says 12w can I use this on my iPad air2
1
vote
1answer
337 views

mid-2012 Macbook Pro Retina 15" won't recognize new adapter

I recently bought a new power adapter off Amazon, and it worked with my mid-2014 MBP at work and my colleague's mid-2014 MBP, but not my mid-2012 MBP Retina 15" (which, frustratingly, it was bought as ...
1
vote
1answer
774 views

Is there a way to get live power usage

I'd like to monitor how much power is being used by my Mac. The tools I've found so far either list the maximum power (85W for my laptop charger) or the processor's usage (Intel's Power Gadget). I'd ...
0
votes
1answer
248 views

Macbook Air recognizes battery while starting, but later says “no battery available” (battery icon X)

I spilled a full glass of water on the keyboard of my Macbook Air 11" mid-2011 (running OS X Mavericks). After drying everything out, etc., here's what happens when I start the laptop: It has to be ...
3
votes
2answers
531 views

MacBook Air 2012 won't charge or boot

I have a Mid 2012 11" MacBook Air that won't charge or boot. I've tested the charger with multiple other MacBook Airs, and the charger works fine. I have researched this and have done everything from ...