This question is def. not a duplicate of the ones linked. "Your Battery is Dead", I'm afraid, is not the solution.  Edit: The event did not happen with AC plugged in, it happened on battery. I then plugged in the AC in order to wake it. The battery is fine and does not need replacement.  So I woke my MBP from sleep, plugged in my iPhone and within a minute, computer put itself back to sleep. I plugged the AC in, woke it up and checked the logs. The offending message is the title of this Q.   My battery has gone through about 926 cycles, so not exactly dead. Couldn't for the life of me figure out what had happened, but I run Micro Snitch in the background, which happened to be telling me that a microphone had kept getting connected/disconnected.   Well, at that point, I quickly realized that the Apple Lightning to USB adapter I plugged in was faulty and constantly cycling on/off, thus throwing my machine into disarray, as Photos and iTunes are set to open automatically when my phone is attached.   I'm guessing that the algorithm used to determine "remaining charge" decided that if my laptop kept doing what it was doing, the battery would very quickly die, so it put itself to sleep.   Of course, I could be wrong.   My question is, does anyone know where I can look to verify this (or what) happened, exactly? 'Low Power Sleep' isn't exactly an error, so my guess is this would be logged as an ordinary event.   Here is current battery info:    Charge Remaining (mAh):   4893   Fully Charged:    No   Charging: Yes   Full Charge Capacity (mAh):   7426   Cycle Count:  926   Condition:    Normal   Battery Installed:    Yes   Amperage (mA):    3586   Voltage (mV): 12436   Thanks.
14959
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 is attached.
66895
I was at school SSHing to my homebox. All of a sudden, my connection was closed. Attempting to reconnect failed. When I returned home, I discovered that my computer was off.  Nobody was at my house and I am sure that I did not have a power outage.  How can I figure out how or why my computer shut off? Is there some log in /var/log that could point me in the right direction? Should there be a core dump somewhere that I should find? If so, how do I use core dumps?
44987
Something came up today that bugged me a bit, I left my laptop on battery power before going to bed. When starting it up the battery was dead. I plugged it in, and here is what happened:  The startup progress bar came up for a while and then a forgot password prompt came up, with questions like: "set a new password" + 2 other options that I can't remember (they weren't relevant) and a previous and next arrows.  Puzzled, I hit previous and the dialog froze. I proceeded to restart again and ended up on the same dialog, I reset my password to the same as my previous and that was it.  Any idea what might have happened?
13821
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 packed as I do not currently have time to set it up for my development work.  Update: It's charged 90%+ but not being used.
94883
I've just purchased a Dell P2415Q monitor which I've connected up to my MacBook Pro (running OS X El Capitan). Everything works great in terms of the display, however I've noticed that it goes into power-saving mode (i.e. shuts off the display) as soon as I disconnect my MacBook Pro from its power source.  Given the battery is already charged up I don't want to keep it plugged in as I suspect it will damage the battery life if I keep it that way for a long time (and I do intend to take my MacBook Pro out and about for other uses).  Does anybody know how I can make the display work irrespective of whether my MacBook Pro is connected to it's power source or not?
93235
Always on USB ports will provide power to a device even when the laptop is shut down. Obviously this can be problematic for battery issues, but sometimes a user wants this capability all things considered.  Do the Macbook Pro offer this on any of the USB ports and if not is there any chance its wired and just has to be enabled?
10300
I've been experiencing a very annoying problem lately. Often, I've got my MacBook Pro connected to  power when I'm working from the office. At home, I often leave it unplugged until the battery is too low to continue at which point I plug it in. The problem occurs when my device is connected to a power supply. My battery indicator shows 100% charge which is fine. But sometimes the battery starts draining and the menu bar icon says &quot;Battery not charging,&quot; even when it's connected to a wall socket, and it keeps draining until absolutely dry. It doesn't even warn me the battery is running low because it shows &quot;Power source: Power adapter&quot; which I guess disables the Operating system low-battery warning. This has happened on multiple occasions. I've already tried several things, I've swapped chargers, swapped wall sockets, started with as few tools/apps running as possible. But the problem comes back. I also can't really tie this to a specific app or behavior,  AFAIK. Does anyone know what might be causing this behavior and what to possibly do about it?
8227
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 was at 1% or less but this happens when the battery is at anywhere from 30% to as high as 48% full. The power cycle info says 500 cycles or so. Both of them do this. They are both patched current, always. I asked Apple they suggested NVRAM PRAM and SMC reset, as expected, which had no effect. Any ideas?
29614
I have found myself in situtations where the internal battery has been used frequently. How do I check its status without diving into the mountain of directories?  NOTE I need to know about the CMOS battery. not the laptop's power supply, so this isn't a duplicate of those questions
39498
I would like my laptop to hibernate itself when the battery level is 10% to be sure it has enough power to complete the operation properly. Actually if I don't pay attention my laptop informs me it will hibernate when it's too late, so instead it brutally shuts down. This kills lithium batteries and is not acceptable.
66482
My 1.5 year old Dell Studio 15 notebook computer has a battery and I keep it attached to the notebook but 98% of the time I just plug in the power adapter.  Lately when I unplugged the power adapter, the battery was only good for 10 minutes, and a few days ago, when I unplugged the power adapter, the computer simply turned off.  When clicking on the battery icon on Win 7, it says "Plugged in, not charging":    is the battery dead?  Or can Windows 7 have any option to not charge the battery?  It is a Dell Studio 15, I wonder if in such case, it looks like it can be a manufacture's defect, would Dell replace the battery? (if there was a recall, then they probably would, i think).  The notebook is 1.5 year old.
120340
Out of nothing, my  became extremely hot while charging. So hot, I could not even touch it.  What could cause it?  I've been using it so I can leave multiple old 85W MagSafe chargers at various places, so I plug my new late 2013 15" Retina MacBook Pro without having to bring a charger.  Edit:  After inspecting for discoloured parts, I saw the flat side of the aluminium surface is a bit discoloured.   This is what I've done after it got hot:   I cleaned everything a couple of times with finger nails and a wooden toothpick (to prevent scratching: electric stuff doesn't like metal fragments). The connector kept getting hot. After turning the connector 180 degrees, it kept cold. If I turned the power plug 180 degrees or 360 degrees, it stays cool too.   Turning 180 degrees was  by  and seems to fix the issue every time this happens.
45657
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 battery is off.  And even if it did I generally miss it because I use it external monitor attached to my Macbook Air. And because I play Spotify, I may miss the warning sound, too.  Is there warning box for low battery on El Capitan? If not, is there any utility or software that may help for external monitors and even playing music?
75205
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 getting a battery life of only 4.5 - 5 hours now.   Is there a way to find if my battery was replaced or not?
9175
I have a 2015 MBP for work, which I connect my iPhone (6 plus, iOS 10) to charge, and I don't want to trust the computer, ever. However, I must click "Don't Trust" every single time I connect for charging. This is asymmetric to the "Trust" selection, which remembers my decision.  Does anyone know if it's possible to stop the 'Trust/Don't Trust' modal from appearing every time, and have the machine not be trusted?  If possible, can you please tell me how? If not possible, can you please provide proof or evidence that lead you to this conclusion?  Finally, I am not concerned with arguments or opinions about this feature. Only what is outline above.
115105
My old laptop has a faulty battery, which shows 100% when on AC power but when unplugged it dramatically drops to random percentages within seconds and makes the machine turn off brutally. I am afraid of damaging my SSD (and my HDD) on which Ubuntu is loaded.   I wanted to turn the PC off as soon as the AC power is not available. I searched here and found . But I don't understand the answer for that question or atleast it is relevant to my situation.   Please explain me a way to shut down my laptop automatically as soon as the AC power is unplugged or when there is a power failure.
91086
I have had this laptop for just more than a year and never faced any problem with it until sometime back when I got a "tingling sensation" using the track pad, just around the edges. That happens only when running on AC.  When I Googled I see there seems to be a problem with this laptop. However, many posts in different forums talk about two pinned adapter as a probable cause but I have a three pinned one. The wall outlet is earth grounded properly.  Since I never had this problem, is this about faulty hardware or other environmental factors? It had been a hot day and the night is cold (but it has been so mostly this season), also I have scrapped my fingers around the nails lightly (just thinly peeled off skin) doing gardening.  I just want to know what's happening, as I cannot call the customer care till Monday. Any clues?  Update:   The harder I press the track pad, the more the sensation. I got it again, even when running on battery but with the adapter chord plugged in and AC off! I unplugged it and the shock was gone. I plugged it back in and the shock didn't return! Its funny. I am not even able to see a pattern.