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

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71
votes
7answers
105k views

Should I disconnect my MacBook Pro's power cord when the battery is fully charged?

Title says all. My friend told me that I need to disconnect the power cord when the battery is fully charged. Otherwise, I will shorten the life of the battery. Is that true? I am going to use my ...
54
votes
7answers
39k views

I am missing the option to see the remaining battery life as time in the menubar?

In previous versions of OS X the battery indicator in the menubar included options to show the remaining battery life as percentage or time (or nothing). In Mountain Lion, there's only an option to ...
48
votes
7answers
119k views

Is charging iPhone all night harmful to my iPhone?

I normally charge my iPhone all night to get 100% power, does this charging way harm my phone? Or, specifically, phone battery?
46
votes
7answers
23k views

What are the best practices for battery longevity?

How do you maximize the cycle count of your battery? There seems to be a debate between: Leave plugged in 24/7 but do a full cycle once a month Charge to ~100%, drain to ~10%, repeat. NOTE: ...
44
votes
10answers
80k views

Can I use 45/60/85W MacBook chargers interchangeably?

I have a 13" Macbook Pro that came with a 60W power adapter and a 15" Macbook Pro that came with a 85W power adapter. Can I use either adapter with either laptop? There seems to be disagreement in the ...
32
votes
3answers
90k views

Can I safely charge my iPhone 4 overnight on a regular basis?

First time caller, long time listener: I've seen this question asked on a few other sites but with no "definitive" answers. The Apple website on iPhone batteries is ambiguous, at best, and the ...
29
votes
14answers
27k views

Why is iOS 5 draining my battery so fast?

My wife's phone went from lasting a full day to needing a recharge every few hours after upgrading to iOS 5. Mine still works fine after the upgrade. What might be causing this?
28
votes
8answers
39k views

How do I debug an out-of-control “kernel_task” process?

Just recently I noticed my battery life having a pretty significant drop and the "kernel_task" process using quite a bit of CPU (a constant 1-6% on my 2.8ghz dual-core i7, 2010 MBP). Obviously I think ...
19
votes
3answers
17k views

Why does GPS on the iPhone use so much power?

I keep reading in articles that GPS on the iPhone, or any cell phone for that matter, uses a lot of power, but I've never heard an explanation of why. Why is this? The phone doesn't have to transmit ...
17
votes
5answers
10k views

How to disable battery charging?

From the pmset man page: POWER SOURCE ARGUMENTS -g with a 'batt' or 'ps' argument will show the state of all attached power sources. […] Certain Apple battery calibration tools may ...
16
votes
1answer
4k views

I don't ever use Siri, but it's using too much battery

I never use Siri, but when I look what has been draining my battery it says it's Siri!
15
votes
4answers
5k views

Can iPhone battery apps actually prolong battery life?

I've seen a few apps that claim they do some kind of conditioning/deep charge/other jargon to extend the life of an iPhone battery. Is this just hokum or do I really need one of these apps to maximize ...
15
votes
3answers
5k views

Is a refurbished Macbook Pro's battery new?

When you buy a refurbished Macbook direct from Apple, is the battery in it new? I cannot seem to find a definitive answer on their website or on the internet. I am concerned that the savings from ...
15
votes
5answers
32k views

How to disable the SpeedStep when using MacBook Pro without a battery?

First of all, the specs: MacBook Pro (15-inch, Early 2011) OS X 10.9.1 (Mavericks) 2.3 GHz Intel Core i7 8 GB RAM The Problem Recently, my battery randomly died and I had to disconnect it, ...
14
votes
8answers
238k views

Battery diagnostic tool at Apple Genius Bars

I have a one-year old iPhone 5 and it's battery performance has dramatically decreased over the last few months. As I could use my iPhone for over 24 hours a year ago, the lifespan has halved by now. ...
14
votes
4answers
12k views

Why won't my MacBook Pro automatically sleep?

I have my MacBook set to go to sleep after 2 minutes while on battery (via the Energy Saver preference pane.) However, when I leave it idle, it only turns off the screen—it does not actually sleep. ...
13
votes
3answers
15k views

Charging an iPhone, difference between USB port and power outlet

The power outlet has more power obviously, but maybe the computer USB is suffice to charge it at maximum speed. Is there a difference between charging an iPhone using the computer USB port and using ...
13
votes
3answers
17k views

Why does my MacBook Pro die without warning?

I have a MacBook Pro (about 18mts old) which has recently started to inexplicably die without warning. I'm running it on battery and, yes, it's getting close to the bottom end (between 10 and 25%). In ...
12
votes
8answers
41k views

How to figure out iOS device battery health?

I'm looking for ways, similar to coconutBattery for OS X to figure out current health of battery for iOS devices.
12
votes
3answers
4k views

Is it safe to always leave a Macbook Pro on?

I have an external monitor, keyboard, and mouse connected to my Macbook Pro. I have the lid closed and have it running. I run it as if it were a desktop PC, always on. I only shut off the LCD ...
12
votes
2answers
5k views

Should I use the adapter or the battery?

I want to know when my MBP's battery was fully charged it's better to unplug my adapter and use my battery power or still let use adapter power? I somewhere read that when MBP's battery was fully ...
12
votes
5answers
60k views

How to maximize Macbook pro retina's battery life when working with AC power?

I'm working 95% of my time with AC power and Thunderbolt Display. Since macbook pro retina's battery are no longer easily switchable I'm concerned about it's life and would like to maximize it. Before ...
12
votes
0answers
42k views

How can I assess the health of my iPhone 5 battery? [duplicate]

I suspect my iPhone's battery is now much worse than it used to be. How can I assess this? Is there some kind of test I can make, to compare it with Industry average? How long can I reproduce a movie,...
11
votes
3answers
250 views

What is the procedure for replacing the battery on an iPhone?

What is the procedure for replacing the battery on an iPhone?
11
votes
2answers
7k views

Should I avoid booting my MacBook if it's really cold?

As the title says; if my MacBook has been exposed to minus degrees, should I wait for it to reach room temperature before I boot it or am I just paranoid and have nothing to worry about?
11
votes
1answer
258 views

Macbook started to consume battery more quickly

This seemed to happen after I did several things at once (all of which I have since reversed in trying to track this down): installed a (Crucial M4) SSD drive (replacing my old SATA 5400 RPM drive), ...
9
votes
1answer
1k views

How does Coconut Battery determine a Macbook battery's design capacity?

A macbook's battery has three charge numbers: The current charge The maximum charge The design capacity Even if a Macbook remains plugged in, OS X does not attempt to charge—as long as (1) is 95% ...
9
votes
4answers
7k views

Does an iPad consume more battery power when there are multiple applications open?

Does an iPad consume more battery power when there are multiple applications open compared to let's say, having only one application resident in memory? If there are differences between the ...
9
votes
6answers
12k views

Does Google Chrome have a significant impact on MacBook battery life compared to other browsers?

I've been reading , a bit about users noticing a severe drop in battery life when using Google Chrome. I'm curious if this is a real issue - and attributed to the rendering/flash engine it uses.
9
votes
2answers
647 views

Battery warning ''Service battery"

Battery warning "Service battery". This warning have appeared in my MacBook Pro (2008) with Snow Leopard. Is there a way to find out what a reason of this warning, without apply to service centre?
9
votes
1answer
7k views

How to know the duration of battery usage in one session?

I would like to know how long was my battery running since it's last charge. There is a built-in time-remaining counter but I would like a time-used counter.
9
votes
1answer
50k views

What causes iPhone low battery crashes? Is there a software fix?

Some iPhone users (especially those with devices that've been in use for a while) encounter a problem where the device crashes once the battery gets low. For example: "After updating to iOS 7 ...
9
votes
5answers
55k 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 ...
8
votes
10answers
37k views

How long should my MacBook Pro battery last?

I have brand new Macbook Pro (15", i5 2.4GHz, 4Gb RAM) purchased at the end of May 2010 and Apple advertises up to 7 hours of wireless web battery life, however I consistently getting only about 4 ...
8
votes
5answers
10k views

How can I make my first generation iPad's battery last longer?

What are some of the things I can do to make my iPad (Wi-Fi) battery last a long time once it is charged? I have the first generation iPad and run iOS 3.
8
votes
5answers
26k views

Does overcharging a MacBook degrade its life?

I have an early 2011 13" MacBook Pro and I use it almost like a desktop. I leave the power cord connected all the time. Is this OK? Am I ruining the computer or diminishing its lifespan?
8
votes
2answers
56k views

Does the Apple Genius Bar replace Macbook Air battery on site?

I called Apple's toll free number but wasn't able to get a clear answer from them. My 2011 MacBook Air's battery is dying and I would like to have it replaced. The only problem is that I am ...
8
votes
5answers
107k views

Why do iOS devices take such a long time to turn back on?

Often I will realise my iPhone or iPad is about to run out of battery, run around the house looking for a charging cable and plug, and get back just in time to see the screen go black and the little ...
8
votes
1answer
1k views

How is the battery level calculated in the magic mouse?

I wonder how the battery level in the magic mouse is calculated. This question about battery problems raised another one, I would like to know how the electronics in the magic mouse work and evaluate ...
8
votes
3answers
17k views

iPhone claiming low battery in cold weather

With the cold weather, a rather odd problem appeared on my iPhone 4S – whenever I use the phone in weather below ~12 °C, it turns itself off and claims to be out of battery. This most often occurs ...
8
votes
3answers
832 views

Battery life decreased after upgraded to Lion

Has anyone noticed any battery life decrease after upgrading to Lion? I'm on MacBook Pro (mid-2010). Before, on Snow Leopard, when unplugged I had minimum 5hrs of life. Now, it's not much above 4hrs ...
8
votes
1answer
597 views

Is there a way to force “low power” graphics?

Is there a plist or hidden config to set my graphics/energy preference to "Always use low power/ integrated graphics"? Seems like energy saver preferences only allow choosing between: Smart auto ...
8
votes
3answers
9k views

Battery on white MacBook shuts off abruptly after 30% charge is left

I have a white MacBook (MacBook4,1). I have owned and used it for over two years now (30 months, as coconutBattery would have me believe). coconutBattery and Battery Health Monitor both report that ...
8
votes
3answers
3k views

Does the MacBook Air draw power from the battery or wall socket when the battery is at 100% and plugged in?

I have a MacBook Air 13" (late 2010 model). I use it both as a portable computer (i.e. not plugged in, drawing power from the battery) and as a desktop (i.e. plugged into the wall socket) regularly. I'...
8
votes
3answers
20k views

Difference between autopoweroff and standby in pmset

I just got a new Retina MacBook Pro 15". After getting some downloads interrupted due to the computer going to sleep (even on AC power), I started looking at the man page for the pmset command. I did ...
8
votes
3answers
16k views

What are real life iPhone 5 battery run-time expectancies?

I got my iPhone 5 this week. While browsing with Safari, on WiFi (which I am using to post this question), my battery life drops at a steady rate of 1% per 5 minutes. I have been timing it from 64% ...
7
votes
10answers
7k views

How long should a 2007 Macbook battery last?

My girlfriend's battery won't last 1 second, so it obviously needs replaced. But I just bought a new battery from Apple a few months ago and it seems to discharge extremely quickly. Are there any ...
7
votes
3answers
185 views

AppleCare for iPad

I just picked up an iPad and the sales "specialist" was completely unconvincing for me to get the AppleCare extended warranty. I realize the iPad is fairly new, so not a lot of failures yet, but I am ...
7
votes
3answers
1k views

Is there a battery conditioner for an iPod touch?

My iPod Touch's battery is not performming as well as it should. I've had it for a while. Is there such thing as a battery conditioner that might help get the battery performance better?
7
votes
2answers
21k views

Old iPad not charging after no use for a year

I have an old iPad and want to give it to a friend. I plugged it in with a new lead that charges another 1st gen iPad I have, but it's not coming on. It's not been used for about a year. It's been ...