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

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49
votes
7answers
28k 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 ...
39
votes
6answers
43k 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 ...
33
votes
6answers
10k 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: ...
30
votes
3answers
81k 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 ...
26
votes
14answers
26k 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?
15
votes
5answers
22k 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 ...
14
votes
3answers
10k 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 ...
14
votes
4answers
11k 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
4answers
3k 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 ...
13
votes
2answers
3k 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 ...
11
votes
3answers
3k 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 ...
10
votes
3answers
8k 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 ...
10
votes
2answers
3k 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?
10
votes
2answers
3k 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 ...
10
votes
1answer
210 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
6answers
53k 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. ...
9
votes
6answers
9k 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
4answers
36k 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 ...
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
4answers
5k 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
3answers
8k 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 ...
8
votes
2answers
511 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?
8
votes
3answers
184 views

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

What is the procedure for replacing the battery on an iPhone?
8
votes
1answer
21k views

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

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 ...
8
votes
2answers
18k 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
2k 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 ...
8
votes
3answers
7k 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
19k 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 ...
7
votes
10answers
5k 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
2answers
2k views

Why is my battery time so much shorter after jailbreak?

I've been impressed with the better battery time of my new iPhone 4 as compared to the 3G I had before. Yesterday evening, I finally jailbroke the 4, and the battery time today has been much worse ...
7
votes
3answers
8k 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 ...
7
votes
2answers
14k 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.
7
votes
3answers
823 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 ...
7
votes
3answers
146 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 ...
6
votes
4answers
9k 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?
6
votes
5answers
38k 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 ...
6
votes
1answer
774 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
6k 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 ...
6
votes
3answers
343 views

Does the real-world MacBook Pro battery life scale linearly with it's capacity?

I have a well-worn battery on my 2010 MacBook Pro. After 467 charge cycles, I get about 3 hours of the normal 6-7 hour range. Using coconutBattery shows me that the charge capacity is 5783 mAh, ...
6
votes
3answers
2k 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. ...
6
votes
2answers
169 views

How can I increase battery life with iOS 4?

Since I upgraded to iOS 4 on my iPod touch second generation my battery life is draining very fast. Is there anything I can do to help with that?
5
votes
3answers
161 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 ...
5
votes
3answers
650 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?
5
votes
4answers
8k views

How long does the battery last on mid-2011 MacBook Airs?

I know that one of the big innovations in the MacBook Air was in the battery (which gets most of the internal volume of the computer!) What is a normal loss of battery life (change in usable time on ...
5
votes
7answers
11k views

High processor/CPU load on iPhone, draining battery, how to fix?

My iPhone sometimes gets very hot and drains battery extremely quickly. When I use the app iStat to check processor load, it shows high numbers (above 2, where it is normally 0.5, not sure about the ...
5
votes
3answers
6k views

Charge from USB on computer or wall socket?

Is it OK if I keep charging my iPad and iPhone using the Mac USB ports? Or is it better to charge them with the supplied chargers? I understand that charging slowly is better (though I'm not sure ...
5
votes
4answers
4k 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, ...
5
votes
1answer
1k views

Is there a way to get the OSX battery icon to display both percentage and time?

I am working on a 2006 MacBook with Snow Leopard. The battery level indicator has the option to show Time or Percentage remaining. I would like to show both. Is there a way to enable this? or Can ...
5
votes
3answers
675 views

Which model of Macintosh has the longest battery life?

I was exclusively a PC man (specifically Dell, Gateway, and HP), but I am now planning to buy a Mac, because my sister has a Mac, with a battery life (much) longer than mine, and I would like to ...
5
votes
2answers
404 views

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, it wipes off but not completely and to me it smells like battery. can anybody tell me if i have a problem here or if ...