N9's battery jumps to 4% when stressed
 

Hi guys, I'm new to the forum :)
I'm in love with my N9 since march but I always (or very often) bump into this problem when using the 3g connection for a while under 50% but also wifi or camera at lower percentage ( around 15%). Is there a solution for this? I'm using PR1.3

Re: N9's battery jumps to 4% when stressed
 

its a known n9 bug. When it happens switch off your phone give it 2-3mins before booting it again... Your actual percentage should now be reflected...

Re: N9's battery jumps to 4% when stressed
 

Hi, I have a similar problem.
I think that the battery is getting old, I'm thinking of replacing it.

Re: N9's battery jumps to 4% when stressed
 

Yeah that's what I do, but It's quite annoying :( I guess replacing won't help?

Re: N9's battery jumps to 4% when stressed
 

It happened to me once when I had Bluetooth (paired with headset), 3G, IM and a Gtalk Video call all running at once. I turned all connections off and waited for a minute, the battery percentage went back up to 30%.

Re: N9's battery jumps to 4% when stressed
 

N9 battery calibrate:
use your battery entirely empty. Charge the N9 battery to the full, when phone power switched off whole time. when it is 100% you can turn it on, but do not remove charger before it is fully booted!. ( If you did remove it.. battery cal did not work like it should ;) ) Whola! Battery will last longer ;)

Re: N9's battery jumps to 4% when stressed
 

I wish there were a way to kill bme and restart it

Re: N9's battery jumps to 4% when stressed
 

I wouldn't worry about this much. It drops to 4%, you know you've got around 15% and it's time to charge!

Re: N9's battery jumps to 4% when stressed
 

Right, but it also happens when I'm a 46% like yesterday :confused:

Re: N9's battery jumps to 4% when stressed
 

Let's dream a bit... It will be fixed in PR 1.4! :rolleyes: (no way I know..)

Re: N9's battery jumps to 4% when stressed
 

As thedead1440 wrote this is a known bug.

To elaborate: The remaining battery charge itself does NOT suddenly drop. The battery is not defective. It's just the OS that - because of the bug - suddenly reports a wrong value of the actual remaining charge which causes other functions - like for example the low battery warning and power save mode - to kick in. Rebooting will cure the wrong reading and after a reboot you'll see the reading being (almost completely, minus the power needed to restart the phone) back to what it was before. Also you can continue using the phone without rebooting until the phone shuts itself off.

Edit:

I assume the bug is known:
http://harmattan-bugs.nokia.com/show_bug.cgi?id=1144
but unfortunately not fixed.

Re: N9's battery jumps to 4% when stressed
 

Would restarting bme show the correct percentge? Is that even possible?

Re: N9's battery jumps to 4% when stressed
 

Sorry! I type my guide wrong.. Fixed! http://talk.maemo.org/showpost.php?p...90&postcount=6

Sorry about that. Now it will work!

Re: N9's battery jumps to 4% when stressed
 

I'll sure try this at the next charge! Thanks:)

Re: N9's battery jumps to 4% when stressed
 

I think the reason why the battery percentage will drop suddenly is that the lithium battery just works like that. At full charge, it has higher voltage and stress withstand but when the charge is getting low the battery cannot offer the same punch of power as at higher charge states. Therefore, the battery voltage will drop suddenly at a power demanding situation (the battery cannot hold the voltage because it has not enough charge left) and N9 will recognize it and will alarm. (The Li-On or Li-Po battery will work fine on voltages between approx. 3.2 to 4.2 V, but below that it has no charge left. The voltage must be higher than 3 V because otherwise the battery will die or at least be damaged. If it is stressed at low voltages the battery protection circuit will cut the power comsumption and the phone will be shut down.)

If you don't use any wirelesss connections or stress the CPU the battery will go down evenly.

It would be nice to know how the battery will work after the calibration: does it have the sudden percentage drop or not?

Also, if you just put the lock screen on after the sudden drop the battery percentage will rise a bit after a while.

Re: N9's battery jumps to 4% when stressed
 

I read around here that this is how expect your battery to last:

96%->75%: longest time of charge being held

75%->50%: average

50%->25%: draining fast

25%-4%: crashing :p


I don't know how accurate it is but from my own usage i think its quite apt...

Re: N9's battery jumps to 4% when stressed
 

no need reboot, do in xterminal

1. devel-su
2. /sbin/stop bme; /sbin/start bme

Re: N9's battery jumps to 4% when stressed
 

wow that's great :) it works great :D
Is there a way to use these commands as "custom action" in Profilematic?

Re: N9's battery jumps to 4% when stressed
 

I had crashes to 4% from 300 to 400 mAh charge level last week; it had been rising slow but steady during the year.

I did Makeclick's solution of letting it really run dry and then charging the phone when it was shut down. It was harder than one would assume as the phone has the tendency to try to boot up when it is connected to a charger instead of going to recharge mode. 'Shutdown -h now' as devel-su seemed to work best if it woke up unnecessarily.

I didn't pay attention to restarting part of the trick, but during three full recharge cycles I saw "the dip" move down 100 to 150 mA between every recharge, and after the third time the battery (or bme) seems to be calibrated spot on.

Re: N9's battery jumps to 4% when stressed
 

here's the way to have an icon on Your homescreen to restart bme without having to type all of that each time.

in text editor write:

/sbin/stop bme
/sbin/start bme

and then save it as bmeup.sh in /home/user/scripts (create it if doesn't exist)

in terminal type and run: chmod 777 /home/user/scripts/bmeup.sh

then in text editor write following:

[Desktop Entry]
Encoding=UTF-8
Version=1.0
Type=Application
Terminal=false
Name=bmeUp
Exec=/bin/sh -c "echo <your root password> | devel-su -c /home/user/scripts/bmeup.sh"
Icon=
X-Window-Icon=
X-HildonDesk-ShownInToolbar=true

and save it in /home/user/.local/share/applications folder as bmeup.desktop file

and that's it - now You'll have bmeUp icon on Your homescreen. tap it and bme will be restarted and battery percentage set correctly.

This way the icon is a simple green one - You are welcome to create one and share it here as I'm not very into icon creating and designing process. Icon You would like to have as bmeUp icon should be uploaded to Your N9, and full path to it written in "Icon=" line in bme.desktop

EDIT: thanks to knobtviker, zvjer, TMavica

Re: N9's battery jumps to 4% when stressed
 

Here's one!!

https://openrepos.net/content/almostdev/batteryup

Re: N9's battery jumps to 4% when stressed
 

Attached is one I will be including in my next release of the iOS 7 theme. To use move to the active themes icons folder (/usr/share/themes/[blanco/Full iOS7 theme/whatever the theme directory is]). Then use icon-l-bme as the icon name.

Re: N9's battery jumps to 4% when stressed
 

I tried to install but gives an error after installing starting, unable to install, on repos I found a link in comments, downloaded that, worked, but then I saw it was another thing.
What can be the cause? If boot time woudnt take so much I woudnt need this but...

Re: N9's battery jumps to 4% when stressed
 

@youFailed: link from @Lucazz990's post up there, and then:

"Please notice that if you have changed your your root password, you should edit the /home/user/bme_restarter/upafterbattrydrop.sh script!!"

Re: N9's battery jumps to 4% when stressed
 

sorry, but i'v installed battery up from a link, it installed, but when i tap the icon...it is'nt an effect! tap the icon 4% and no action!
what should i do?! what may i do now to restar bmw from this app up?! 10x :confused:

Re: N9's battery jumps to 4% when stressed
 

To restart bme takes some time.
Check if the app works from the commandline. Should be something like this:

If there is some warning about an incorrect password, you have to adjust the root password in that script.

But indeed, sometimes just nothing happens if you tap on the app icon. But sometimes, the charging percentage jumps back to normal. Just to fall back to 4% in a couple of minutes if you continue using your phone in the same way as before... :D

Edit: Oh, and to restart bme only brings the charging state back up if you actually experienced a drop to 4%, not if the battery discharged slowly.

I also find it very amusing, how the N9 warns you about your battery during these drops. Everytime I see the notification that my battery is low, I instantly do something to get it back up by connecting to a charger or quickly using this app. Because otherwise, the phone just says: "Battery low", then instantly "You should now connect the charger", then instantly "Battery empty" and then it's over becase the phone just switches off. You get like NO time to react to this :D Kinda ridiculous somtimes. It actually nearly happened right now while I typed that sentence. Funny!

Re: N9's battery jumps to 4% when stressed
 

Yesterday my battery was on 67%...i'v started the Battery up app and than...the level was 52%...todaty again...My battery level was 98% (after the method of MAKECLICK) and after the Batteryy up app starting...wash 82%...is there a bug in the app or its normal...for example, when my battery level goes to 4%...after the activation of a Battery Up app, there is no effect...whats the problem?! :eek: