Questions tagged [battery]

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

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111
votes
9answers
172k views

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

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. Other people say you should drain it once a month or ...
4
votes
2answers
60k views

Fully charged MacBook Air turns off when power cord removed

I have a MacBook Air, 2009, with a recently replaced Apple battery in December 2012. Recently, when power cord comes off, the computer shuts down. Also, it usually will not restart unless power cord ...
4
votes
2answers
3k views

Mid 2012 MBP shuts down claiming no power with charge at 30% or 40% or more

I have two mid 2012 MBPs. Sometime last year they both started randomly shutting down and showing the 'please plug me in to power' image when trying to start them up. That would be fine if the batter ...
51
votes
10answers
37k views

Can I manually limit the %CPU used by a process?

I would like to limit the amount of CPU time dedicated to certain processes (e.g. Firefox, Safari, ...). I can't understand why such programs, even when not used (nothing loading, no animations, ...
7
votes
1answer
3k views

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

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. I ...
68
votes
10answers
149k 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 ...
2
votes
1answer
3k views

How to determine the cause of MacBook battery not charging?

I see that the question "why is my MacBook not charging?" gets asked a lot. The problem is, there are multiple reasons. Possible points of failure are: charger, cable, magsafe connector, DC input ...
69
votes
9answers
33k 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: Taking ...
22
votes
6answers
23k 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 ...
5
votes
3answers
5k views

When apple replaces the battery in a 15" MBP retina, do they replace the entire top portion of the case?

Apple's site says it is $199 to replace the battery. Do the techs replace the entire top portion of the case including the keyboard and trackpad? I've read a few things on the internet alluding ...
27
votes
4answers
48k 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
2answers
46k 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 ...
2
votes
1answer
3k views

How to preserve MacbookPro battery from degradation? [duplicate]

Platform: OS X: Yosemite 10.10.4; MacbookPro 15" Retina (mid-2015). Fact: There is aging for battery in any case - using or not. But while using - there is difference of how to use. My questions - in ...
42
votes
10answers
54k 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 ...
3
votes
2answers
4k views

Why does a 12 inch Macbook refuse to turn on with a lot of battery remaining unless it is plugged in?

This Early 2015 12 inch MacBook was showing 75% battery remaining, and when I plug in my iPhone to try to record the iPhone, the Macbook began to sleep and refused to turn on when I press the power ...
2
votes
1answer
3k views

Why does my iPhone power off when the battery is down to 30%? [duplicate]

Today I was walking using my iPhone 6S running iOS 9.3 as a pedometer and it shutdown. When I got home and plugged it in, it said 30% capacity. That seems strange. I would expect it for 2% or 5% ...
27
votes
6answers
62k 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, ...
18
votes
6answers
53k views

How do I check an iOS device's battery health?

I am looking for a way to check the current health of a battery for iOS devices, similar to how coconutBattery works for OS X. How can I check the battery health for an iOS device?
7
votes
2answers
2k views

Battery Full Alert [duplicate]

Is it possible/necessary to configure a "Battery is full, remove charger notification" similar to the Low Battery Alert? I run macOS Sierra on my computer and wonder what software or scripts or ...
34
votes
3answers
91k 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 ...
12
votes
2answers
66k 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 my ...
16
votes
5answers
19k views

Is the Macbook 12 inch's USB-C charger interchangeable with other USB-C chargers or devices?

If there is only the Macbook 12 inch USB-C charger nearby, can it be used to charge other USB-C devices, such as any Android phones that also use USB-C? (will it "too powerful" and damage other ...
11
votes
3answers
2k 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 ...
7
votes
1answer
4k views

Is it possible to disable CPU throttling on a MacBook Pro with a completely dead (not recognized) battery?

I have a MBP late 2011 running El Capitan, recently my battery died (x over the icon and "no battery available" in the dropdown.) I've noticed since then that CPU intensive tasks are very slow, and I ...
4
votes
1answer
1k views

How can I disable CPU throttling on Late 2006 MacBook with no battery? [duplicate]

The problem I am experiencing is that if the battery is not present, the CPU is automatically throttled. I have done some searching and have found that this is apparently by design, "in case the ...
3
votes
2answers
4k views

How often should I remove the charger from my rMBP? [duplicate]

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 ...
3
votes
3answers
815 views

Battery - Shut down or sleep an MBP

For the lifetime of a battery, is it better to shut down or sleep an Mac book Pro? Could anyone be able to explicit a full answer to this question?
2
votes
2answers
417 views

Battery service and insanely low maximum charge

Recently my Macbook Pro Retina Late 2013 has started to shut down unexpectedly while running on battery. I thought it was because of my CPU was too hot but it was not the case. When checking it ...
51
votes
5answers
13k views

Why is it better for an iPhone’s battery to NOT close down apps?

I know apparently it’s not a good idea to close apps on your iPhone to save on battery. I’ve read questions and answers like Does force closing apps have any benefit on iOS devices? but it still doesn’...
24
votes
8answers
70k views

iPhone 7 won't charge from my MacBook Pro [duplicate]

My iPhone 7 which I recently bought doesn't charge with my MacBook Pro Retina 2015. It always shows for one second that it recharges but then something like lost connection and then again. and goes on ...
18
votes
7answers
362k 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. ...
31
votes
14answers
29k 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?
23
votes
3answers
31k views

Check the battery level of connected bluetooth headphones from the command line

I am trying to check the battery level of my wireless headphones from the command line. I came across a few discussions, and it seems all I need to do is enter the following: ioreg -c 'deviceName' |...
13
votes
1answer
633k views

iPad won't turn on after a complete battery drain

My 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 ...
12
votes
2answers
6k 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 ...
9
votes
1answer
8k 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?
21
votes
3answers
11k views

I think my MacBook Pro battery was replaced by Apple's service team. How do I check that?

I handed my MacBook Pro (15" Touch bar) to the service centre in order to have the keyboard replaced. Now, when I check the battery cycle count, it shows "1". Before it was at "82". Also, I'm ...
3
votes
2answers
3k views

Macbook Pro Battery 0% and wrong date

Model: MacBook Pro Retina, 13-inch, Early 2015 While I was working, I didn't realize that the battery was low and as a result, my MacBook Pro shut down when the battery had no power. So, then I ...
2
votes
3answers
4k 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 ...
6
votes
6answers
43k views

MacBook Air Battery is not charging, no light, still be able to power up, battery condition is normal

I experienced this behavior two days ago (My MacBook Air is late 2011 version (4.2): I can still power up my Mac, with or without MacSafe charger connected Battery is not charging There is no light. ...
6
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...)
5
votes
1answer
184 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, ...
3
votes
1answer
4k views

MacBook Pro early 2015 not turning on and not charging

I'm far away from civilization thats why I need your help guys. My problem is: MacBook Pro 13" early 2015 is not turning on and charging and the trackpad is also dead. Charger's LED does not shine by ...
2
votes
3answers
27k 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 ...
58
votes
7answers
42k 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 ...
23
votes
1answer
25k 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 -...
16
votes
4answers
13k 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. ...
16
votes
3answers
22k 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 ...
13
votes
5answers
66k views

iPhone 5S suddenly turns off at 30-40% of battery life

I have iPhone 5S with 10.1.1 iOS. I have experienced few situations where my battery life was about 30-40% and iPhone immediately turned off. When I tried to turn on it indicated low battery and kept ...
9
votes
1answer
18k views

Will my Battery get harmed if not used for long time?

Will my MacBook's battery be damaged if I do not use for next couple of months? I bought a new Macbook Pro (March 2015) a month back. So far I have not started using it yet. It's charged and box ...