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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12
votes
2answers
107k 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 ...
12
votes
3answers
333 views

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

What is the procedure for replacing the battery on an iPhone?
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5answers
276k 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 ...
12
votes
2answers
7k 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
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2answers
40k views

Extreme energy usage by Spotlight

I recently (two days ago) updated to El Capitan on my work machine (15" MBP, Mid 2015, 2.5 GHz Core i7, 16GB ram, R9 M370X, 500GB SSD) and ever since then, Spotlight has been draining my battery and ...
12
votes
2answers
71k 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 ...
11
votes
1answer
7k 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% of ...
11
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3answers
39k views

“Battery not charging” on MacBook Pro

I have the infamous "battery not charging" problem on my 2014 Retina MacBook Pro. The power source shows as "Power source: power adapter". I checked system info and I have 1100+ cycles, which I guess ...
11
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2answers
953 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?
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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 ...
11
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3answers
13k 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 ...
11
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5answers
85k 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 ...
11
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4answers
63k views

MacBook shut down at 20% battery with no warning? [duplicate]

My 2013 13" MacBook Retina (OS X 10.10.3, Yosemite) shuts down when I have about 20 minutes of battery left. Not sleep, full shut down. It does this with no warning at all. I seem to remember ...
11
votes
1answer
4k 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 ...
11
votes
1answer
314 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), ...
11
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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,...
10
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4answers
5k views

Would using an iPad as a second monitor be harmful to its battery life?

I have a Macbook Pro and an iPad Pro 9.7". Using Duet, I can use the iPad as a second monitor. That's awesome for my setup - but Duet requires the iPad being connected to the host machine through the ...
10
votes
5answers
13k views

Can I charge a 2017 MacBook Pro with a third-party USB C power adaptor?

I've got a 2017 MacBook Pro which comes stock with an 87W USB C Power Adapter. I want to purchase an additional power adapter, but I don't require an official Apple one. I notice that Anker make one ...
10
votes
7answers
13k views

MacBook Pro continually wakes while in sleep mode [duplicate]

I've a 15" MacBook Pro (mid-2015) OS X 10.11.1, and I noticed that my MacBook loses 20% power while in sleep mode for 12 hours. This is a small part of my log file when my MacBook Pro was in "sleep" ...
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votes
4answers
42k views

Low Battery Alert for Mac OS X El Capitan

I have Macbook Air, Mac OS X El Capitan. There is no warning box shown before the battery is near %15, like it did for Mountain Lion. So I can not notice and my computer goes sleep simply when the ...
10
votes
3answers
74k 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 ...
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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.
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2answers
50k 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 ...
10
votes
2answers
13k views

Macbook pro doesn't go to sleep after left inactive

In Energy Saver settings (System Preferences -> Hardware section) the Mac is set to sleep after 15 minutes, but nothing happens. Mac drains battery and automatically turns off when battery is low. ...
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votes
3answers
19k 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 ...
10
votes
1answer
2k 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 ...
10
votes
2answers
10k views

Mac wakes up for no reason during night (El Capitan)

Since El Capitan (10.11) I have problems with draining battery. So I searched through forums and didn't find right answer, but they gave command which show logs. So this is the log. <Notice>: ...
10
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2answers
3k views

adjust battery-warning-level of magic mouse

How can I adjust the level at which Mac OS warns me about the battery of my magic mouse? I always have a lack of batteries, so I would prefer if the battery warning comes up at 15 or 20%, so I could ...
10
votes
1answer
1k views

Utility to warn when process takes 100% CPU for x minutes?

I run on battery a lot and occasionally a process/app will crash in the background and start sucking up 100% of one or more cores. That in turn burns my battery down way faster than normal. I used ...
9
votes
5answers
11k 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.
9
votes
4answers
8k 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
1answer
9k 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?
9
votes
2answers
37k views

How can I preserve the battery cycles on my MacBook Air?

I recently got my MacBook Air, and the battery cycles is already at 12. Is this good/average? I don't know if I am not charging it properly or something, because I don't want to ruin my battery in the ...
9
votes
1answer
23k 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 ...
9
votes
1answer
1k views

AirPods battery level with `ioreg`

I can query the battery level of my bluetooth devices with ioreg with ioreg -r -l -n devicename | grep '"BatteryPercent"\ =' with the following devices Keyboards: IOAppleBluetoothHIDDriver, ...
9
votes
1answer
1k views

How to select power direction over USB-C

I have a USB battery which has a USB-C port on it. When I connect it to my MacBook Pro (regardless of whether the MacBook Pro is running off its battery or via the mains), the Mac doesn't charge the ...
9
votes
2answers
3k views

2016 MacBook Pro shutdowns when the lid is close with cause 0

My 15-inch 2016 MacBook Pro is now experiencing shutdowns when the lid is closed. Though it is not a crash because I don't get a crash report when I turn the computer back on (unlike the problem I had ...
8
votes
3answers
220 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 ...
8
votes
2answers
4k views

What is the life expectancy of a Magic Mouse 2 battery?

I would like to know what is the battery life cycle of a Magic Mouse 2. Or the approximate number of charge/recharge cycles before its battery's performances will start to reduce visibly?
8
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5answers
2k views

Does force closing apps have any benefit on iOS devices?

I've gotten mixed answers from various websites and people concerning this question, and I wanted to put it out there for all of you to answer once and for all. The question is, does force closing ...
8
votes
1answer
2k 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
2answers
11k views

What is this brown sticky residue in my MacBook Pro charge port?

I have just noticed a brown type of sticky residue in my charge port on my MacBook Pro, it wipes off but not completely and to me it smells like battery. Can anybody tell me if I have a problem here,...
8
votes
3answers
500 views

What charging mechanism to be used to maximise the battery life?

So I got my first Apple laptop, a Retina MacBook Pro. Since macbook pro retina's battery are no longer easily switchable I'm concerned about it's life and would like to maximize it. I have few ...
8
votes
3answers
854 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
2answers
40k 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 ...
8
votes
1answer
2k views

MacBook: woke up to an empty battery, how to get battery history?

On Sunday I purchased a brand new MacBook Pro 13" w/TouchBar. I used it a little last night and put it in my backpack with 75% battery life. I shut the lid and assumed the MacBook was sleeping when I ...
8
votes
3answers
9k views

Which uses more battery when tethering - Wifi or BT on iPhone 4S?

I'm not really bothered which is quicker - I'm guessing this is wifi anyway. I just want to know which would allow me to get the most life out of my iPhone 4S when tethering to it with may MBP. Thanks!...
8
votes
2answers
2k views

Update MacOS on a MacBook with dead battery

I have a macbook 12'' running sierra that I use occasionally. The battery died some time ago, showing an X in the status bar. I want to update to a new version of macOS but the installer shows: ...
8
votes
3answers
5k 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
1answer
16k 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.

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