Sleep without low battery warning

Hey all,
My MBP 17" - 3weeks old- has twice in the past 48 hours gone to sleep straight without any low battery warning. It has made numerous beeps while just going to sleep but wakes normally.
Suggestions?

If you haven't already, make sure to calibrate the battery, following the exact instructions in the manual or on Apple's article on calibrating the battery. (Make sure to scroll to the bottom for the MacBook Pro instructions.)

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Macbook no longer "sleeps" after 'low battery' warning, just suddenly dies

My macbook (just over a year old) used to give me a warning with 10 minutes left that it would sleep so as my data was not lost, if I didn't plug it in. However, recently, it has stopped doing this - instead of sleeping, if I don't get to a power source in time within 10 minutes, it simply cuts out, with the sound of the hard drive stopping - like if you shut down a frozen macbook with the power button.
This is REALLY irritating - what's going on? Why does it not sleep anymore, and is there any way to fix it?
I'm on Tiger 10.4.11, with an intel macbook...

Same Problem here. Tried several calibrations, smc and pram zap (well i guess there is no pram any longer so it zaps something else). Now I found another post where they talk about the battry 1.2 update. http://discussions.apple.com/thread.jspa?threadID=1449128&tstart=60
I remember when trying to do an battery update to 1.3 manually the update told me that it is not for my macbook. But - I found the 1.3 update Bundle in /System/Library/Configuration/BatteryUpdater.bundle
1. I Removed /System/Library/Configuration/BatteryUpdater.bundle from my system
2. rebooted
3. Emptied trash
4. Installed update 1.2 by Softwarupdate.
I will now do an SMC reset an then let the battery run low and watch what happens.
Then do a calibration.
I have the problem here in different ways. Sometimes Macbook shuts down suddenly after low battery warning, sometimes it sleep, almost never it hibernates.
My Battery was replace after showing the x symptome about a year ago but now it looks bad again
Full Capacity (in mAh): 3866
Remaining Capacity (in mAh): 1982
Power Consumtion (in mA): 1564
Voltage (in mV): 11974
Number of cycles: 148

No "Low Battery" warning on new (November 07) MacBook - Kernel Panic

Hello,
I'm not sure is this is the right forum for this, but since the problem occurs during a specific battery state, I'm going to post it here.
I just got one of the new November 07 MacBooks. The machine is great, and screams with the pre-installed Leopard.
First thing I did was plug it in to charge as I started configuring software. Once it was fully charged, I pulled the plug, and began using it on battery. My plan was to calibrate the battery, by running it all the way until it forced a sleep, then shutting down and plugging it in again, as Apple recommends.
Problem is, I never got the "Low Battery" warning, or even the sleep warning. At around 10 minutes of power left, I simply got a kernel panic. A few seconds later, the laptop just switched off.
I plugged in again for a few minutes, then ran it down again to see if I could reproduce the error, and I did get the low battery warning.
The next time the battery ran down, it gave me the kernel panic.
Is this happening to anyone else? Is it a new MacBook problem, or a leopard power management problem? I'm having no other issues at all with the MacBook or Leopard. Any help would be appreciated.
Thanks!

I'm a little hesitant to force a firmware update on a MacBook it wasn't meant for. These are brand new models, and I would think Apple didn't ship them with the known faulty batteries or bad firmware.
The frustrating thing is I have no way of knowing who the culprit is. Is it the brand new OS that I'm sure has a fair share of bugs? Is it the new hardware having a power control issue? Or is it a combination of Leopard and the new hardware? I was hoping to find some users who had the same problem so I could narrow it down. Battery drains out, kernel panic, then the machine shuts off after a few seconds. Funny thing is, the indicator says I have like 10 minutes or so left, but it appears that the battery must be completely dead, since it forces a panic and the machine just dies. So it might be a calibration error. The Mac thinks it has some juice, but in reality it's just about dead.
I made an appointment for the Apple store tomorrow, so we'll see what they have to say. It's otherwise running beautifully, thankfully.

Low battery warning. (cross post)

at what percent do you usually get this warning at? on my iBook i would get it at 4% but now on my MB i get it at 8% and when it drained to 0 my MB shut off and didnt go to sleep? is that normal?

I keep getting a low battery warning when I start up my laptop.
I usually have it plugged in when I use the laptop.
It is saying I might need to replace the battery. Has anyone else had this problem?

[SOLVED] Low battery warning form acpi

Hello!
I hope you could help me out, as I am stuck.
I am trying to automate pm-utils stuff on my laptop, that I have until now been doing by hand with CLI. I installed acpid and I really like how it works as it is very easy and clean to add event handling for closing laptop lid etc.
But I was unable to use /etc/acpi/handler.sh to detect low battery warning. Only event that is received under "battery" is when the AC adapter is plugged in or battery is removed/inserted, but not when battery is low.
I tried to find more info on this, but discovered only that it is supposedly possible to configure alarm level in /proc/acpi/battery/BAT1/alarm, but that file seams to be depreciated and it's replacement (?) /sys/class/power_supply/BAT1/alarm contains a number resulting in about 3% charge, that should have been sufficient for at least writing to log file if any event was received from the battery, but nothing was. (And anyway, I don't know how to configure it using this file, as I am not allowed to write to it and it gets overwriten by something.)
So I could really use some pointers on why the acpi event for low battery doesn't get generated (or why I am missing it) or what alternatives I have.
I really would not like to run a cron job for checking battery level, as the acpi event method seams much more beautiful to me and would allow me to sleep better.
Thanks a lot!
Last edited by beatle (2012-01-06 01:20:29)

/dev/zero wrote:No worries :-) If you can think of any ways to improve the script, I'd be interested to know. It isn't perfect because output from "acpi -b" is unpredictable.
I did adapt your script a bit to suite my needs (Thanks for showing how to write deamon scripts! I haven't thought that it is so straightforward and beauty full.) , but I wouldn't say I improved it as I am basically illiterate in bash.
For now I deal with the output of "acbi -b" by searching for the "NN%" (with grep, as I know not of a better way) - remaining percent of battery charge - in it, as I suspect this sub string would allays appear in "acbi -b" output even when the 'remaining time' part is unpredictable (haven't checked it though!).
Also, my laptop is usually on mute so I changed the text-to-speech warning to a i3-nagbar popping up. (And along the way learned how to control spawned processes in bash! I love just GNU/Linux!).
/usr/sbin/battery_monitor_loop
#! /bin/bash
SLEEP_TIME=5 # Default time between checks.
SAFE_PERCENT=30 # Still safe at this level.
DANGER_PERCENT=15 # Warn when battery at this level.
CRITICAL_PERCENT=5 # Hibernate when battery at this level.
NAGBAR_PID=0
export DISPLAY=:0.0
function launchNagBar
i3-nagbar -m 'Battery low!' -b 'Hibernate!' 'pm-hibernate' >/dev/null 2>&1 &
NAGBAR_PID=$!
function killNagBar
if [[ $NAGBAR_PID -ne 0 ]]; then
ps -p $NAGBAR_PID | grep "i3-nagbar"
if [[ $? -eq 0 ]]; then
kill $NAGBAR_PID
fi
NAGBAR_PID=0
fi
while [ true ]; do
killNagBar
if [[ -n $(acpi -b | grep -i discharging) ]]; then
rem_bat=$(acpi -b | grep -Eo "[0-9]+%" | grep -Eo "[0-9]+")
if [[ $rem_bat -gt $SAFE_PERCENT ]]; then
SLEEP_TIME=10
else
SLEEP_TIME=5
if [[ $rem_bat -le $DANGER_PERCENT ]]; then
SLEEP_TIME=2
launchNagBar
fi
if [[ $rem_bat -le $CRITICAL_PERCENT ]]; then
SLEEP_TIME=1
pm-hibernate
fi
fi
else
SLEEP_TIME=10
fi
sleep ${SLEEP_TIME}m
done
Hm, and just now I got an idea, that, in order to avoid the unpredictable "acpi -b" I could use the acpi information form /sys/class/power_supply/BAT1/* directly as I already have a deamon running. Will try that out.
Last edited by beatle (2012-01-06 18:17:41)

MacBook shuts down after low battery warning

Hi,
up until recently my macbook's battery has been working just fine. but then lately i noticed that a few minutes after it displays the low battery warning it shuts down by itself.
before, when the low battery warning would display i could still continue working on my macbook for several minutes until it goes to sleep -- only then would i connect it to the power cord.
unlike the other posts (concerning batteries) that i've read, i have no problems turning my macbook on/off before or after this event has occured. neither does it shut itself down when the battery is halfway. my problem really only happens after the low battery warning has been displayed.
i wanted to calibrate my battery but then that would require my macbook to go to sleep once it reaches a battery level of less than 5%-10% -- mine just shuts down completely.
is this shutting down thing a substitution mechanism to save the laptop's memory -- instead of going to sleep, it'd just shut down?? how can i fix this?
thanks in advance for the help.
MacBook Mac OS X (10.4.8) 512MB, 2GHz Intel Core Duo

For what it is worth, I now have the same issue. Only I don't even see the low battery warning, it gets to 15% or 10% and bang, no power. This is not good, by the way and is bound to corrupt something in the system as OSX requires some house keeping when you shut down the computer properly. This instant off is not a proper shut down. I took my MacBook in and they wouldnt simply replace the battery, they want to keep the computer and give it back to me in a few days. I rely on this puter for work 5 days a week, so I was trying to avoid this.
Oh well I guess a trip to the Apple store is unavoidable.
Regards,
RacerX

Macbook Pro won't login after sleep (sleep with low battery -- mac turned off maybe it's called save sleep)

Macbook Pro won't login after sleep (sleep with low battery --> mac turned off maybe it's called save sleep)
So if I hit the powerbutton my mbp booted like it is booting from the save sleep (so very fast and the login screen is there in about 10 sec.and there is no apple logo while booting just the desktop screen in "unsharp" ore foggy however...)
Then when i see the login (if the keyboard backlight turned on) i wand do tipe in my code but it won't work... the trackpad is not working; and when i plug-in a usb mouse the mbp is not powering on the usb-mouse (laser is off)
Why is that this way?
Is there n option to wake up the mbp fromm deep/save sleep without haveing issiues after that?
THX

Sorry for such a long delayed response...
I was able to get to an apple store this past weekend, and let me tell you... I'm about finished with there great "support".
Right before I went to the store, I tried to eject a disk. Well the cloth in the SuperDrive (I assume to protect the drive from dust and such) Pulled up with my disk. So I get the Apple store, describe my problem and what happened with the cloth piece. The "Genius" writes up a form and tells me they have to run diagnostic and it will take a couple days... and I will get a call when its done (1-3 days).
Well on day number 3 I called up the store and they told me it was ready to be picked up? I asked if anything had been fixed and they told me they could not reproduce my "sleep issue", so they couldn't fix that.. but told me the cloth piece in the SuperDrive had been fixed.
I drive an hour (one way) to the Apple store to find that all they did was PULLED OUT the cloth... they did not replace it! So basically I have a hole for a Super Drive.
I asked why I was not called to say that my computer was ready to be picked up... didn't get an answer on that one.
I asked why my SuperDrive was said to be fixed, when nothing was done... they told me that it would have to be sent out to the factory store for that to be fixed (FIRST TIME THEY MENTIONED THAT!) Oh, and that would take 5-7 business days. Well that's not going to happen right now considering I'm a college student that NEEDS a working computer!
So I go home, angry... start just putting all my important documents back on the computer. And the screen starts blinking!!!! I guess now I have the same thing described in another post on these forms...
Lets just say that I'm not very happy with Apple right now! If anybody else has success on either the sleep issue or the screen blinking issue, please let me know!
Thank you!

MPB C2D fully charged at 85% low battery warning keeps coming on?

I purchased my MPB C2D back in Nov 06, recently I've been experiencing drastic drop in battery life after charging overnight. When I use my MBP the following morning, battery meter shows 85%, "low battery warning " comes on, and within 5 mins, it goes to sleep. Anyone know what the problem is?

When did you last re-calibrate the Battery ?

Low battery warning comes on too late?

Hey guys. I've been having this problem where the computer shuts down like 20 seconds after the reserve battery power warning. I literally dig into my backpack for it as soon as the warning pops up, and then as I'm plugging it in, it shuts off. The point of having the warning is to give me enough time to plug it in. Is there a way to change when the warning comes on? Say, at 15% instead of 7%? And isn't it supposed to go to sleep, not shut down? Because mine is completely shutting down less than half a minute after the low battery warning.
I'm running a 2008 Macbook Pro and have a brand spanking new battery and battery charger that I bought from the apple store about 2 weeks ago. I remember the low battery warning used to come on at around 9% when I first got it, and then it would still run a good 15 minutes after that before going to sleep.
Also, I am running it on higher performance, not better battery life. Oh and I'm still on Snow Leopard. Let me know if you need any other information. Thanks in advance.

think your battery is bad but you can also try the smc & pram reset.
SMC: http://support.apple.com/kb/HT3964?viewlocale=en_US
PRAM: Hold Command Option P R at startup until you hear the chime twice.

Abrupt loss of power, no low battery warning

a familiar story, but haven't been able to dig up a solid solution in past discussions--so perhaps a fresh suggestion...? (thanks in advance!)
okay, so one moment the battery indicator shows 45 minutes remaining; the next, my tibook puts itself to sleep or shuts down entirely. and when i plug it back in--yep, the battery indicator shows a 0% charge.
this is actually my 2nd battery for this tibook, a replacement i purchased from apple after the 1st died as expected. for the life of that 1st battery, i would always see a low battery warning before shut-down, and the charge indicator generally was on target. but as for the current battery, even though it's relatively new (maybe just over a year old, 193 cycles) and still holds a decent charge (lasts a couple of hours), i can't even recall the last time i saw that warning message before the computer went dark on me. i tend to stay plugged in, but when running on battery power the charge indicator seems pretty accurate--unless i dare to get anywhere near depletion as described above, and then suddenly it's way off the mark and the screen is dark.
i've tried messing with power settings, follow tips for maintaining battery life, etc.--no luck. surely the battery can't be dead already!
...though that would figure since i can't return it anymore... and since my extended applecare plan expired a week ago, maybe now my (replacement) adapter will explode and almost burn the house down like the 1st one did. sheesh.
anyways, big-time thanks for any insight or suggestions, much appreciated.
PowerBook G4 (ti) Mac OS X (10.3.9)

maybe the power mangement unit on your logic board is broken?
The more people experience the same symptoms, the more I doubt it.
did you do all the resets pram etc?
Yes, of course. To no effect.
While I am trying the "trick" described above by SuperSizeIt (discharge until forced sleep + sleep for another whole day + recharge to maximum), please: everybody go to SystemProfiler and check their capacity. Is it going down from charge cycle to charge cycle, as in my case?
Initially I had: 4200 mAh
After just six cycles in three weeks: 3176 mAh
So the drop is more than ~170 mAh/cycle. I would consider a few mAh normal, but certainly not this much!
Now, I would like to know whether this symptom is just part of the problem described in this thread, or an additional one.
Powerbook G4 400 Mhz Mac OS X (10.4.4)

Shut down after low battery warning

Hi
After I get the low battery warning on my iBook G4 (about 30 seconds) my iBook unexpectedly shuts down, I have tried recalibrating the battery several times, including shutting the lid to put it to sleep after the warning then plugging it in and waking it (to recalibrate you are supposed to wait until the machine sleeps) and letting it charge right up.
I have also tried resetting the PMU, although I dont think this is working as I hit shift-ctrl-apple/option-and the power button, and all that happens is the machine starts up as usual, according to the documentation, I should have to then power up the machine.
Is itr just that my battery hasd had it? I have notice it only takes an hour/hour and a half to run the battery down, and only about 30mins or so to charge.
Thanks for any help in advance.
Mike

That definitely sounds like a battery that wants to be replaced.
My iBook behaved in a similar manner--except the "low battery" warning wouldn't even show up!
I think it's time for you to pick up a new battery--they run about $100.
~Lyssa

No low battery warning, just shuts off

I have an Core Due Macbook back from September 06, and recently I've stopped getting that low battery warning message. Now my laptop will just shut off at 20min (sometimes even 30min) without any warning. I tried recalibrating the battery, it solved the problem for one charge (I saw the warning message once) but after that it went back to shutting off at 20min again. I've heard that Apple has extended their battery coverage, but my laptop is at 315 cycles now. I do have the extended warranty though-will that cover a replacement battery?

Hi. Recalibrating the battery does not prolong battery life. It will only help in getting a more accurate battery charge when using the computer on battery power alone. What you can do is make sure that you have the battery update and latest software from apple. Also, try resetting the SMC of your computer. Here are the links for more info. Hope these help.
http://docs.info.apple.com/article.html?artnum=303319
http://www.apple.com/support/macbook_macbookpro/batteryupdate/

No low battery warning on new Macbook Pro (Mid 2012)

Hello!
I just purchased my macbook pro this saturday and it's my first mac. I've noticed that I do not receive a low battery warning at all. What can I do about this?

Thanks for the battery info, but the steps for calibrating the battery don't apply to current laptop models.
>>
Portables with built-in batteries
Current Apple portable computer batteries are pre-calibrated and do not require the calibration procedure outlined in this article.

What can I use for a low battery warning on a Mac Book OSX10.8?

What can I use for a low battery warning on a Mac Book OSX10.8?

What you should see above all your windows when your battery gets to low.

I just got a "low battery warning" on my iMac... What is that all about???

Just got a low battery warning on my screen. What does it mean? What do I have to do to correct this? Could this be why it seems to take so long for pages to refresh/display; why the screen seems to frequently freeze and why I frequently see that spinning rainbow wheel?

Your pram battery probably needs renewing.
You can check which one you need here:
http://support.apple.com/kb/HT2295?viewlocale=en_US

Sleep without low battery warning

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