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
106k 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 ...
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 ...
7
votes
2answers
30k views

Using memory with a higher MHz rating? [duplicate]

Can MacBook Pro's successfully support and fully exploit RAM of a higher MHz rating than that which they ship with? For example, take my 15" MacBook Pro (Late 2011) that ships with 4GB of 1333MHz ...
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: ...
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 ...
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 ...
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 ...
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?
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.
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, ...
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?
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 ...
5
votes
1answer
2k views

What is the best way to recharge an iPod Touch battery?

I wonder how to handle the recharging of my iPod touch ? I've heard that there are some actions to have to be done regularly or actions that arms the battery (like memory effect etc...)
4
votes
1answer
169 views

Is it good to keep apps closed on iOS devices?

Is it better to keep apps closed (double tap home button, hold the icon, and exit the app), as much as possible on iOS devices? I know the more apps one has open, the more RAM, for example is used, ...
2
votes
2answers
3k views

How often should I remove the charger from my rMBP?

I want my battery to remain healthy. I used to charge it full then remove the charger after it's done, then put it back on when it goes down to 10% .. However this is becoming hectic and I was ...
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 ...
15
votes
8answers
239k 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
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 ...
7
votes
1answer
7k views

Using bash/terminal to get number of battery recharge cycles

I would like to get the number of recharge cycles using bash (terminal commands). I understand the following command will display all of the battery data, but I want the cycle count on its own ioreg -...
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 ...
6
votes
1answer
5k views

Is it advisable to calibrate the battery on a MacBook?

How useful or necessary is it to calibrate the battery on a MacBook? If it is, should it be carried out when first purchased and does calibration of the battery mean it will also last longer?
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.
7
votes
3answers
3k views

Is there an app that will track “Time since last full charge” on OS X?

I am trying to troubleshoot battery life issues in OS X Lion on my MBA13. Is there an app (or hidden system information) that can tell me how long my computer has been on since last full charge. I am ...
4
votes
1answer
134k views

iPad won't turn on after a complete battery drain

my iPad iPad mini retina is out of warranty I forgot to plug in my iPad after the critical battery warning and it went some minutes following the warning. I was not worried because same thing had ...
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 ...
4
votes
1answer
131 views

What's the best way to prolong the lifespan of a Macbook Pro battery?

I have two Mac book Pros: A 2013 Unibody retina that I use every day An older 2006 model with removable battery that I use a couple of times a month (when not in use, it's not connected to the AC. ...
2
votes
3answers
3k views

Is putting the computer to sleep while it's in a hot car a bad idea?

I know that keeping the battery of a MacBook Air in a hot environment is a bad idea. But sometimes I have to leave it in a hot car. Are there any recommendations as to what to do in this kind of ...
7
votes
3answers
654 views

Event based on battery charge level

I haven't found anything yet so I was hoping maybe someone here had an idea. I want to kick off an even based on battery on an Apple laptop reaching a certain charge level, or when the battery is ...
4
votes
2answers
2k views

Does constant charging harm my Macbook Pro?

I usually connect my macbookpro with the charger 12-15hour/day and 7 days a week. I'm afraid the battery could lose capacity over time. However, I believe modern electronics should be able to handle ...
4
votes
1answer
937 views

iPhone 3GS battery oddities

I bought a 3GS in August 2009. After about 9 months I started seeing occasional precipitous drops in battery level overnight (i.e. from 50% to "dead", as in all you see is the red "charge me" icon). ...
3
votes
1answer
2k views

Regular crashes on iPhone 4S/iOS 6.1.1: due to old battery, or because of updated-for-iOS-7 apps?

For the past 6 weeks, 2-3 times a week my two-year-old iPhone 4S (with no replacement parts) has crashed in the middle of use. I get a black screen with a spinner, and then it powers down. After ...
3
votes
2answers
222 views

Bulge in MacBook Pro near Hard drive

I have noticed in that past 24 hours that two rigid and straight "lines" have developed as bulges on my Mid 2010 MacBook Pro 15 inch. They are noticeable when looking at it in the light and you can ...
2
votes
3answers
2k views

macbook pro absurdly small battery life

My Macbook Pro lasts me about 1.5 to 2 hours max on a single charge. This feels ridiculously low. What can I do to increase the battery life on Macbook Pro? Battery Information: Model Information:...
1
vote
3answers
9k views

Battery is not charging despite SMC reset

I have a problem with charging of my Battery which has been appeared last night. It was working perfectly well for a long time. All of my friends who had different laptops were so jealous at my ...
44
votes
10answers
81k 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 ...
48
votes
7answers
120k 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?
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.
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 ...
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 ...
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 ...
6
votes
1answer
10k views

Best practises for battery/charging MBPr

I have purchased my first macbook recently and would like to know what are the best practises for keeping the battery in good condition.
6
votes
1answer
2k 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 ...
4
votes
2answers
27k views

Battery warning “Service Battery” goes away by itself

I got the "service battery" message when clicking on the power indicator of my MBP the other day, only my battery appears to be fine. Then today, it's gone away by itself, I haven't taken it in for a ...
4
votes
3answers
10k views

iPad boot loop only when powered - brief flash loop when connected to USB - jailbreak gone awry?

Received an iPad from a customer in an unknown state. Report was "does not power on". Device is out of warranty. It's the 1st generation iPad with a 3G chip. Symptoms: when connected to power only, ...
3
votes
3answers
984 views

How can I keep my MacBook Air's battery cool?

It seems that the best advice for battery longevity on my MacBook Air is to keep the battery cool. It doesn't have powerful fans like the MacBook Pro, so I would think that overheating is even more of ...
2
votes
1answer
358 views

What's the easiest/cheapest way to replace my battery? 2009 MBP

I have a 2009 MacBook Pro (5,5); also identified as the A1278 (EMC 2326). I can spend about $150 either taking it to the Apple Store and having them replace it or buying all the stuff from iFixit.com ...
2
votes
5answers
19k views

Is my iPhone 5S draining battery too fast (and is it due to process mediaServerD?)

My iPhone 5s has always had less good battery life than my previous iPhone (4S), but I'd always assumed that it was due to the increased speed of the CPU/GPU and the increased screen size. It also ...
1
vote
1answer
3k views

Battery indicator is showing “Service Battery” notification

I upgraded my macbook RAM, but after that when I switched on my MAC it showed my "Service Battery" indicator in battery menu. I installed Battery Health application and it showed following stats. ...