Low Battery Warning doesn't appear

I used to get the warning.
I searched for it, and don't see an option to have it appear.
Not a huge issue, just that it was a handy warning.
Thanks'

It may help to train the charge and run time estimation (which the low battery warning depends on) if you run your PowerBook's battery down from 100% to 0% nonstop and then recharge it to 100% once or twice. If that does not help, try [resetting the power manager|http://support.apple.com/kb/HT1431?viewlocale=en_US].

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Low battery warning not appearing at 20% of charge left...

When the low battery warning dialog should come in?

My warning went off like at 5%, it said something that I was running in reserve battery.

[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)

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.

Leopard's Low Battery Warning on iBook

Hey everyone,
I recently upgraded my iBook G4 to Leopard. Everything works fine until I run the battery down low. When the low battery warning pops up, it either causes a spinning pinwheel or just appears as a white rectangle with a shadow. Then, after slowing down my Mac for a few seconds, the warning window disappears and the airport and battery icons in my menu bar disappear. A few seconds more, and warning and the icons reappear. The only way for me to stop this cycle is to plug in the adapter.
Help!
Matt

Turns out I was having more problems than just the indicator... after replacing my power adapter everything worked fine.

Low Battery warning at 90%

I have a G4 ibook, that didn't get used for a long time, (over a year) and I am using again after my newer laptop was stolen. The battery may be near the end of it's life, but I am confused by getting a "low battery warning" dialog box, when the battery indicator says 90%.
If it was just dropping quickly I'd assume the battery was toast, but I don't get the conflict between the two pieces of information.
Is there any point in resetting the PMU? Should I just consider this a not-so-portable until I replace it?

Have you tried calibrating the battery?
Calibrating your computer's battery for best performance
If that doesn't help, resetting the PMU may not help, but it wouldn't hurt.

Low battery warning for my iMac keyboard

I keep getting a low battery warning for my iMac keyboard even when it has brand new batteries. Is there a way to switch this off or reset it so that it doesn't keep informing me?

Hello! I also have this problem. My keyboard is brand new and so also the batteries. I have tried with different types of batteries but get the same warning. I also have tried to erase the device in the bluetooth settings and add it again. Nothing works. It is a pity because I like mac.

Low battery warning when battery full

This only happened to me this one time, but I have my iphone plugged in and the battery icon says it is fully charged, but I received a "low battery" warning.
Any thoughts as to why this may have happened?
Thanks!

What version of firmware are you on? There were battery gauge problems in 3.1.2 that 3.1.3 is supposed to fix. Meanwhile, you can try running the battery down until the phone shuts off, then plug in to the wall charger for 4 hours. Do this twice. if it still doesn't work right you may have a bad battery; take it to Apple.

Low battery warning prompts

I got the 20% low battery warning after a standby of 59 hours and usage of 5 3/4 hours. I was browsing the web through Edge when I got the 20% warning. Less than 2 minutes later, the 15% warning showed up. I continued to browse the web for more than 5 minutes and didn't receive anymore warning. At that point I decided to charge the phone. How did I lose 5% of battery power from 20% to 15% in less than couple minutes? Does this happen to anyone? Dropping 5% in less than 2 minutes doesn't make any sense.

I was able to use my iPhone to listen to music for about an hour between the time it said 15% and from the time it just shut off. It probably just depends on what you are doing on the phone. 59 hours is a very long time on standby and it's possible that your battery reading wasn't accurate at that point.

Where is low battery warning in Mountain Lion?

Lion used to give low battery power alerts which I do not find after Mountain lion upgrade. Is it still there or...???

Turbo toes
This helped meRe: Where is low battery warning in Mountain Lion?
Jul 29, 2012 8:51 AM (in response to Kallampad)
It kicks in at 3% on my 2011 MBA, I have seen reports that the % at which it appears can vary quite a lot, from 16% to 3%.
Speculation would be it depends on the fitnesss of the battery?
MrSlinky
Re: Where is low battery warning in Mountain Lion?
Aug 13, 2012 4:57 AM (in response to Turbo toes)
My rMBP's battery had fallen to 3% before I noticed it, and I never saw any popup warning. I was not running anything fullscreen (just firefox covering part of the screen).
Running your battery down to these very low charge levels will shorten its life, try to avoid discharging to less than 40%, try to stay on AC power as much as you can (all the time is better than your current useage profile) and only let it discharge when there is no other choice.

Why does "low battery" warning always come up when I start the iMac?

I've been getting a "low battery" warning lately when I turn on my computer. I've tried 3 sets of new AA batteries (bought from 3 different stores), but that doesn't seem to help. Of course it could be caused by the unlikely event that all three "new" battery packs were not fresh, but that's unlikely.

and you're talking about the mouse ... the keyboard ... ?
also, does the message vanish after a while? what does the battery indicator say?

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 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

Low Battery Warning doesn't appear

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