Questions tagged [power]

The electricity drained by a device

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4
votes
1answer
142 views

Change what percentage/time remaining causes the battery icon on Mac to go red

I'm dead broke. So, I have a cheap battery for my dead-broke-esque 2008 MacBook. It only lasts about 2 hours on a full charge. However, it's a little goofy at times. Not in a dangerous way, just that ...
3
votes
1answer
13k views

How can I force my laptop to shut down when I close the lid?

I'd like my Mac laptops to shut down completely when I close the lid. This is partly for convenience and partly for security reasons. I couldn't find a way to do this in the System Preferences (OS 10....
3
votes
1answer
2k views

How to disable the “this cable or accessory is not certified” message on iPhone?

The message "this cable or accessory is not certified and may not work reliably with this iPhone" pops up whenever I use a 3rd party USB cable for it. It's really annoying, because then I'd have to ...
3
votes
3answers
3k views

How safe is it to replace the magsafe 2 connector with another one by simply connecting the wires?

I have a problem with my magsafe 2 adaptor, it has been stopping to work occasionally for a while now. Until now I always managed to get it to work by yanking the cable (in order to unstuck the pins), ...
3
votes
1answer
454 views

What is the data corruption risk of force shutting down a running Mac?

Eg when the power supply is cut or someone presses the power button for 5 seconds? How big of a risk am I taking to my data? Is it a 1% chance of corrupting data? I know most mac these days have a ...
2
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, ...
2
votes
0answers
895 views

How to avoid external display going off after I unplug a MacBook from the AC Power?

When I have my MacBook Pro 10.10 connected to the AC Power my external display connected through HDMI works fine. As soon I disconnect the MacBook from the AC Power and start running on battery, my ...
2
votes
2answers
1k views

Why doesn't a stripped/cracked MagSafe power cable shock?

Behold, the fate of all (poorly handled) MagSafe power cables: Why doesn't this shock me? I've read that MagSafe cables are low voltage, but I don't even get a tingle. Is there any danger of shock, ...
2
votes
2answers
939 views

I am only seeing 1:50 of estimated run time on a new MacBook Pro battery. Problems?

I have bought brand new MacBook pro 15-inch model with highest specifications in this June. I have also installed newest Mac OS, Lion. However, how it could be strange, when cable is not plugged it, ...
2
votes
1answer
5k views

Powering a graphics card in a Mac Pro 2008

I'm looking to update from the stock graphics card in my my Mac Pro 3,1 (2008). The logic board only has two 6-pin ATX connectors, and the card I'm looking at (a GeForce GTX 760) requires one 6-pin ...
2
votes
1answer
3k views

iPad 4 not charging solution with usb 3.0 dual ports Y adapter

Just recently picked up an iPad 4. Saw that it specifies "not charging" when plugged into the usb port. Saw that it is a common issue due to usb power. I have usb 3.0 ports on my desktop so I tried ...
2
votes
2answers
914 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)?
2
votes
1answer
66 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 ...
2
votes
4answers
30k views

Only my cable can recharge my iPhone

My iPhone cable is the only one that can recharge my iPhone 5. I have tested around 5 other iPhone 5/6 cables and none of them work. I am apprehensive of either losing my cable or breaking it. The ...
2
votes
2answers
9k views

Macbook Pro (Mid 2012) Battery Not Charging

I have a Macbook Pro (Mid 2012) 13" unibody and having issues with a battery that is not charging. Here are the specifics: Battery is not charging Magsafe light not illuminating at all Macbook is ...
2
votes
1answer
35k 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,...
1
vote
1answer
104 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 ...
1
vote
1answer
51 views

How can I charge powerbank that has single C-type in/out from MacBook?

I’m using Xiaomi Power Bank 3 which has following sockets: USB-A type low output USB-A type high output USB-C type power delivery input/output up to 45W It usually works fine, I can use MacBook ...
1
vote
2answers
2k views

Macbook Air (13" 2012) Fails to wake from sleep

The Air doesn't wake up from sleep mode when the lid is closed. Have to do a hard restart by pressing the power button for 5 secs which isn't nice. Tried to select the startup disk from system ...
1
vote
1answer
649 views

External monitor connected via usb-c causes mac to not show low battery notification

I have a macbook pro 15 inch (2017) that I connect to a 32" external monitor via usb-c. Usb-c is also 'partially' charging the mac but not enough to fully charge battery since voltage from monitor to ...
0
votes
2answers
1k views

Battery not charging? (Even after SMC reset)

So, I've seen a couple topics like this that already exist, but none solved my problem. I plug in my charge to my 13-Inch MacBook Air, Early 2015, and the LED light did not turn on, and the battery ...
0
votes
1answer
77 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 ...
0
votes
1answer
88 views

What are the electrical requirements for magsafe charging?

I'm supplying power to a MacBook Pro via a magsafe cable from a broken 60 W power supply. Is it safe (1) to omit the initial high impedance 6 V or 3 V and simply apply "14,5V to 18,5V on Magsafe 1 ...
0
votes
1answer
299 views

Is there a way to view and control the powerstate of the discrete GPU on a 2011 MBP in OSX?

I noticed that running with the discrete GPU uses more power and generates more heat. I just need the discrete GPU to drive an external monitor, I'm not concerned about performance. By controling the ...
0
votes
2answers
52 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 ...