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

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21 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
28 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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0answers
14 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
93 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
24 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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39 views

iOS always-on VPN and battery life

Before setting it up I'd like to know if having an always-on VPN (IPsec) will have a disastrous effect on my battery life. I've searched for a bit and found a few results; this thread says that the ...
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0answers
10 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
81 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
104 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
43 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
1k 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
25 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
36 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
47 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
97 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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1answer
39 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
15 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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1answer
199 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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0answers
119 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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0answers
79 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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0answers
38 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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0answers
18 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
166 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
21 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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144 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
117 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
90 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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0answers
25 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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0answers
13 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 -> ...
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1answer
190 views

New MacBook Pro slow performance, battery not working

I have a very recent (mid-2014) MacBook Pro Retina 15" that has been working fine since I got it (about two months). Suddenly, it has begun to run very slow in all apps, even though CPU usage is very ...
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2answers
29 views

Does a battery's remaining power drop consistently regardless of remaining charge?

how does the remaining battery life when plugging in factor in to the overall amount of usable computer time? E.g., with a full-charged deep cell battery, a fully-charged laptop, a power inverter, ...
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0answers
39 views

Estimating battery life remaining while charging in OS X

Retina Macbook Pro's battery life is amazing, and it is handy having an accurate estimate of how much longer it will last on the remaining charge, in hours and minutes. While charging however, it ...
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1answer
36 views

iPhone battery life continually worsening

I purchased my iPhone 4S on November 8th, 2013, now the iPhone first started having problems in summer, maybe in July. The phone first died at 15%, eventually the problem got even worse. The phone ...
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0answers
7 views

Battery mechanism not working on Macbook

I have a late 2008 Macbook. The mechanism for opening battery part has ceased to work. I want to put new memory in the computer. Is there anyone that could advise on how I get battery out without ...
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0answers
39 views

Can pmset's ChargeInhibit be used to prevent battery charging? [duplicate]

I've been using my MacBook with AC power a lot lately and I thought that if I could use pmset to run on AC power whenever available and keep my battery at roughly 50% that would extend the life of my ...
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1answer
13 views

really bad power consumption on mid-2013 MacBook Air

I'm getting a really bad power consumption on my mid-2013 MacBook Air 11" w/ OS X 10.9.4. I think the issue is that I have too many tabs open in Safari and SeaMonkey, and they're all taking a lot of ...
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1answer
62 views

Does Macbook Air (mid 2013) bypass battery after it's charged?

I have a MBA mid 2013. I was wondering if a MBA is plugged in charge, does it bypass battery after it's fully charged? Because while I am working it's always plugged, I wonder how this will affect ...
2
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2answers
233 views

iPhone 4S iOS 8.0.2 Shuts off when battery is at about 20%

For the past few days, my phone has been shutting off when the battery reaches around 20%. It will not turn back on until I plug it into a power source. When I plug it in, it automatically powers ...
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0answers
26 views

Maximizing iPhone Battery Life [closed]

Regard maximizing iPhone Battery Life, just for my curiosity and knowledge, from a software or hardware standpoint why when we use the iPhone to access data, a Wi-Fi connection uses less power than a ...
3
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1answer
93 views

Understand iOS Low Battery logs

Good morning everyone. I'm kinda new to this site but I see there are many expert opinions, so I would submit to you my question, hoping it will be helpful for someone else. Before proceeding, I beg ...
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1answer
29 views

Concatenating date and cycle count to file on startup

I have the following code from here to find the cycle count of the battery on my computer: system_profiler SPPowerDataType | grep "Cycle Count" | awk '{print $3}' I will enclose it in a simple app ...
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0answers
28 views

Does iOS battery usage include GPS usage?

One of the most common pieces of advice given to reduce battery usage is to disable un-needed GPS features. This is becoming increasingly hard to do as many features such as activity tracking and ...
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1answer
87 views

Battery life Macbook 13 Retina mid 2014

I got a new MBP 13 Retina display, mid 2014. I get on the battery up to 5 hours at most. Is this normal? This is my first product from Apple so I do not know if this is as supposed or I got the wrong ...
3
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4answers
7k views

What is the relevance of “Low Signal” in battery usage stats?

iOS 8 shows "Low Signal" in the battery usage stats, like here: How great is the effect of signal quality on battery life? In other words, if the signal quality was better, would the stats be more ...
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0answers
22 views

Macbook Battery calibration craziness

As explained at this Superuser question, I've bought a generic battery for my 2008 Macbook but didn't need it. Based on the answers, I've decided to use my new battery and proceeded to try to ...
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3answers
80 views

Mac book: Is battery cycle low means mac book still can be used at long time ?

I try to buy an old mac book pro mid 2012. Old user of this mac uses mac by electric all the time, so the life cycle till now just 3 cycles, but this computer has been used for 1.5 years. My question ...
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2answers
65 views

Revive Li-Ion Battery White MacBook (2006)

I have a White MacBook (2006) with a new battery (2013) that I accidentally let sit discharged for too long (a few weeks). Now the battery doesn't work. If I leave the battery in the laptop while ...
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0answers
65 views

Does the “Battery Doctor” technique make sense?

On my iPhone I've downloaded the application "Battery Doctor" (https://itunes.apple.com/gb/app/battery-doctor-master-battery/id446751279?mt=8) which makes you charge your phone while their application ...
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1answer
42 views

I Have A 2013 MacBook Air that refuses to charge. I continue to use it once it says that it has no charge left. What do I do?

I received this brand new laptop yesterday and today the charger isn't responding to being plugged in. (The lights aren't flashing as they should be). The battery icon on the upper right corner has a ...
2
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1answer
115 views

In-store iPhone 5 battery replacement?

I have an iPhone 5 that's eligible for Apple's battery replacement program. I haven't actually had any trouble with it, but I suppose I should take advantage of the offer before it expires. There are ...