Concerning devices that store electrical power which can be used to run various devices in the absence of external power.

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5 views

iPod Touch 1st Gen charging rebooting loop

I have a 1st Generation iPod touch. When I try to charge it, it goes into a loop: The very low battery logo displays The black screen with white apple logo is displayed The screen shuts down ...
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49 views

Macbook pro 2014 15 inch retina purchase considerations and questions [on hold]

Good Afternoon everyone, I am doing research for my first Macbook Pro and have a few questions . I am planning to use it for developing, both in ios and microsoft (.NET). No video games. I am ...
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0answers
17 views

Why is my rMBP drawing twice as much power as my friend's when idle?

Mine is late 2012 and has 8GB RAM. His is late 2014 and has 16GB RAM. Both have an SSD (although of different size) and both are running Yosemite. We set the brightness to 6 pips each and turn off ...
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1answer
20 views

iPod Touch will charge from computer USb, but not from AC outlet

I have an iPod Touch. If I plug it into the AC outlet, with a AC/USB power adapter, the iPod will charge to about 20%, and then stop charging. However, if I plug it into a computer USB outlet (using ...
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1answer
28 views

MacBook Air's battery doesn't charge, Service Battery state, but only 400 cycles

Yesterday everything was fine with the battery in my MacBook Air 13'' 2012 (2 years old). It was lasting for 4-5 hours like new. Today, all of a sudden, the battery has stopped charging at all (I have ...
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1answer
135 views

Is it possible to switch parts between Verizon and AT&T iPhone 5?

I have a water damaged iPhone 5 from Verizon that doesn't work. My cellular plan is also with Verizon. I just purchased an AT&T iPhone 5 from a friend, not knowing that Verizon and AT&T ...
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0answers
29 views

Apple logo flashing?

Last night my iPhone 4s suddenly crashed and I thought it was because out of battery, even though it was still at 17%. I plugged it in and left it for about 10 mins and it turned back on but it was ...
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1answer
28 views

Battery of my Mac with Problems

When I charge my MacBook the battery goes only up to 99% and doesn't reach 100%. Is this something to worry about and if yes, how do I fix it?
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27 views

I accidental went swimming with my iPod Touch 5th Generation

Today, I went to a river and forgot that my iPod was in my pocket. I was in there for about half an hour, and only noticed it once I was changing into my other clothes. Is there anything I can do to ...
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1answer
72 views

Why is my iPhone 5S battery draining overnight and very quickly?

A few days ago I was charging my phone in my car and it stopped charging, and I noticed that the cord had a little hole and smoke was coming out of there. I was buying some food from a local shop, and ...
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11 views

iPhone 4 would not turn on [duplicate]

I got an IPhone 4 yesterday and it would only turn on when it's plugged and I bought it new, and it would turn off when I remove from the plug. Please help!
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1answer
40 views

Once I disconnect from the mains, can I leave the charger cable in the Mac?

I use my MacBook Pro on battery as much as possible, recharging when needed and once a month running it down to recalibrate etc. However, when the battery is charged to 100% I unplug the charger from ...
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1answer
34 views

Battery Cycles being used very fast

I am using a 13-inch mid 2014 MacBook Pro with Retina Display. It is about 3 weeks old and already has clocked 13 charge cycles. Is this too high ? Also, I follow the practice of fully charging it and ...
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1answer
145 views

Battery jumps from 25% to 2% to 36%. What's going on?

I have a 2012 13" Macbook Air running 10.9.5. I seem to be losing battery life as of late. This, itself, isn't a huge deal, as I usually use the laptop near an outlet, but as of late the more annoying ...
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1answer
41 views

Does turning off wifi improve battery life?

I have an iPhone 5 with an unlimited data plan. I usually have it at home where I only have a mediocre cell signal. I don't want to put it in airplane mode just in case I get a call or text so would ...
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2answers
56 views

Is it better for the battery to leave the iPad plugged when charging is done?

I charge my iPad. Later, I notice that the battery is charged at 100 %. Now, what is better to preserve the battery capacity ? Unplugging the cable. Leaving the cable plugged. The answer may ...
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0answers
22 views

iPhone 4S battery life

I checked Settings > General > About > Diagnostic & Usage > Diagnostic & Usage Data, I was able to see log starting with 'LowBatteryLog...' So there is a problem with the battery - what is ...
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3answers
118 views

iPhone 4S shutting down 20-30 % - battery already replaced

I've had my iPhone 4S for 3 years and it now runs iOS 7.1 Battery was performing badly so I decided to replace it. I bought a spare battery online by duracell direct (average quality good!) ...
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2answers
104 views

Any risks/disadvantages of using MacBook Pro as a desktop?

I have used iMac or Mac Pro for my Desktop system for the past 5 years but now consider replacing them with MacBook Pro Retina in desktop environment. The reason is mostly because I don't like bigger ...
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118 views

Macbook Pro doesn't boot with replacement battery. 15 inch late 2011

I bought this replacement battery for my 15 inch Macbook Pro late 2011: http://www.amazon.ca/dp/B00OD7OHLY/ref=sr_ph?ie=UTF8&qid=1419964742&sr=1&keywords=macbook+pro+late+2011+battery ...
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1answer
62 views

Trying to restart a MacBook Pro that went off by itself with a battery that indicated “Service Battery”?

My daughter's MacBook Pro (Late 2011 model) just went off while she was using it. Battery was reporting that it required servicing, so apparently, she was pushing it. After it went black, it would ...
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0answers
19 views

Macbook turns on with loud fan noise

Whenever I try to turn on my Macbook, the fans are super loud straight away. My battery is removed (manually because it looked like it was going to explode). I tried to reset the SMC, but that did ...
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1answer
43 views

MacBook 13" white (mid 2007) - how to treat a new battery for optimal battery life?

The old battery of my MacBook 13" white (mid 2007) is dead (as I always had the MacBook on my desktop and did not bother calibrating or discharging the battery). I bought a new one (original Apple ...
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2answers
33 views

Will it hurt my Macbook Air to be plugged into a “Uni Pak II” which is a dimming power source?

I'm at a conference and the only plug is a "Uni Pak II" which is a dimming power source (here's the manual). At first my charging indicator on the end of the MBA plug didn't light, but I slid up the ...
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43 views

How to identify dead battery in Macbook pro 15" Mid 2010?

I have a Macbook Pro 15" Mid 2010 and I believe it has a dead battery. When I plug in the magsafe adapter it glows green, but the Macbook will not boot when I press the power button. When I press the ...
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1answer
423 views

Macbook Pro Retina Not Working on Battery, but fully charged and cycle count is low

I have an MBPR (15in) that is about 18 months old (no AppleCare). The battery has only 331 cycles on it, and Apple states it should last for 1000. The battery is fully charged, at 100%. If I remove ...
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1answer
27 views

Can I keep my MBPR unplugged when not in use?

If I shut down my MBPr and unplug the power cord every night then in the morning plug it back in and turn on the MacBook, will it have an effect on the battery charge cycles?
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25 views

How to determine USB device charge battery level?

I am trying to get battery state of Jawbone UP24 connected to USB. Using this command: system_profiler SPUSBDataType I got this result: MotionX Band: Product ID: 0x0002 Vendor ID: ...
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3answers
512 views

Why is my iPhone 5S overheating so much?

Activities such as: Phone Calls that last around 10 minutes 3G Browsing for 5 - 7 minutes Watching videos for 5 minutes Using apps such as facebook / instagram etc for 5 - 7 minutes, lead to my ...
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2answers
549 views

iPhone 6 charging best practices

Should I charge every night? (Assuming that I consume more than 50% during the day, but sometimes not much more.) Should I turn off the device during the charge? (Assuming that I don’t need the ...
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1answer
67 views

Macbook Air 13 inch (256 GB/ 8 GB/ i5) along with Windows (Using BootCamp)

I am completely new to the Mac and I am planning to buy MacAir (256 GB/ 8 GB/ i5) model and want to use Windows 7 along with it using BootCamp. I have no problem with MacOSX but need to use Windows ...
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5answers
2k views

Iphone 4S 8.1.1 Battery Problem

What else can I do to make my iPhone 4S work for as long as possible? I have done all the "standard" battery saving techniques recommended on most sites, like: turn off background app refresh, ...
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0answers
42 views

How to make iPhone turned on after charging

I often charge my iPhone when it ran out of battery. I often postponed charging my iPhone until it really run out of battery. After I charge my iPhone, I usually go to sleep or rest or forget about ...
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0answers
56 views

iPhone 3g battery drops from 60% to 0%

My friend gave me his old iphone 3G, which I've brought to an unlock-service so I can use it using my own simcard. It works, but sometimes the iPhone suddenly stops working while the battery still ...
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1answer
95 views

When the apple store replaces a battery in a 13in retina MacBook Pro, do they replace the top case and keyboard/trackpad assembly too?

I ask because I have a key missing and my keyboard and would like them both fixed at the same time.
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1answer
231 views

If we run out of battery and then charge iPhone, will it turn back on?

I just called by my lawyers 133 times for some very important message. My iPhone is just 3 meters in front of me being charged. Finally my lawyer come to my apartment and we both saw that the iPhone ...
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2answers
85 views

Iphone 3GS not charging

My IPhone was on 20% last night and I immediately plugged it in to the wall, it continuously kept connecting and disconnecting and at times giving "Charging is not supported with this accessory". ...
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1answer
25 views

MacBook Pro (5,5) restarts when powering microcontrollers

My Macbook Pro (13-inch, mid 2009, Intel Core 2 Duo) has an odd problem with the USB ports. Occasionally, when plugging in, removing or restarting a microcontroller such as the Arudino or Teensy, the ...
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2answers
738 views

Macbook Air - battery drains while sleeping (but not when shut down)

My macbook air (13-inch, mid 2011) battery drains from ~100% to ~85% over night. The problem only started a few months ago. I'm currently running yosemite, but the problem started while on ...
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236 views

Tweaking OS X 10.10 Yosemite to auto-toggle Reduced Transparency when on battery

I am curious about whether there is a way in OS X to hook to some events to find out whether the laptop is plugged into power. (And furthermore how we can control the "Reduced Transparency" settings ...
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109 views

iPad Mini won't charge or even show whether it's charging or not on the screen

Recently, my iPad Mini has had problems charging. I would have to plug and unplug the iPad several times before it starts charging. Today, the battery ran out and I had to charge it again. But, it ...
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64 views

Macbook gets power but does not charge

I have a Macbook (Core 2 Duo, 2011 model) which does not charge when I attach my Magsafe charger attached to it. However, it does not discharge as well as apparently it does get power from it. This is ...
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22 views

Replacement Battery for iPod Video Works temporarily

I have an iPod video that needed a replacement battery due to it not holding a charge and only working while the iPod was plugged into an outlet or computer. After the first replacement the iPod ...
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0answers
359 views

iPhone: What is `accountsd` and why is it using 80% CPU?

I just got a new iPhone 6 for my SO and noticed that it is quite toasty to handle with the battery draining quite fast. It has been 24 hours since I first set it up. I plugged it into Instruments ...
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1answer
25 views

Power consumption of a bash command

I want to run a bash script on my jailbroken iPhone whenever it is being charged. Currently my script looks like this: #!/bin/bash ACpower=$(pmset -g | sed -n '2 p' | grep -o '*') if [ "$ACpower" ...
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315 views

MacBook Air battery at 100% but shuts off when unplugged

I've been having a bit of a nightmare with my MacBook Air battery this last few months. This is my final shot at trying to solve the issue before I resign myself to needing a new machine. Machine ...
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1answer
175 views

Model Name: MacBook Air Model Identifier: MacBookAir4,2 Processor Name: Intel Core i7 Processor Speed: 1.8 GHz

Battery life catastrophic since upgrade to Yosemite - activity monitor shows 'spotlight web content' items using large amounts of CPU for webpages that are not even open?? Does anyone know why this ...
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2answers
142 views

How to disable Spotlight indexing when on battery?

Every time I add a few MBss of files to my SD disk, Spotlight starts eating battery (per Activity Monitor Energy Impact) for one to several days indexing them. How can I make indexing to turn off ...
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49 views

What does “main screen” actually refer to, in battery usage?

On iOS 8, there is the battery usage screen showing an estimate of the battery use, per application. It also has an entry for "Main screen". I assumed it was just displaying the main screen with the ...
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16 views

power and 13inch macbook pro

may I ask something about battery and power ? I have A 13 inch macbook pro , early 2011 . MC700 . what's the normal range of Voltage (mV) that should appear in the System report -> HARDWARE -> ...