ubuntu-phone team mailing list archive

[Marcin Xc <gtriderxc@xxxxxxxxx>]

There is one more thing I'm testing at the moment: influence of the opened apps on the battery life. I'll share my test results tomorrow but as far as now it may be the cause. As I wrote my first answer, my phone was connected to the USB and fully charged. Then I asked myself what did I do last week that could have any influence: I opened a movie in a web browser (I had it open the whole last week "to watch later:-)") and switched to the scope view. Then locked the screen.I lost already 8% (?!) in an hour.I'm not sure if it wasn't the OTA-13 that brought us that change that opened apps wake up faster/stay updated  after unlocking the screen. Perhaps this may be the cause? Tomorrow I can answer that question. This could also explain why rebooting helped someone in bug#1629465-we just close all the opened apps. I opened "Matrix"(the movie) (because of its lenght) in a web browser, then switched to scope view and locked the screen. The answer's gonna come tomorrow. But these 8% in an hour doesn't look optimistic.Cheers
Marcin

      From: Martin Bolte <martinbolte@xxxxxxxxxxxxxx>
 To: Marcin Xc <gtriderxc@xxxxxxxxx>; Martin Bolte <martinbolte@xxxxxxxxxxxxxx>; Ubuntu-phone <ubuntu-phone@xxxxxxxxxxxxxxxxxxx> 
 Sent: Friday, October 14, 2016 5:31 PM
 Subject: Re: [Ubuntu-phone] Power management in OTA 13
   
 Hey Marcin, thanks for sharing your experience. I will do some experiments regarding the charging. 
  Acutally related to my usage - travelling frequently - it happens from time to time that the battery gets unloaded totally so that the phone connects. I also noticed that with a remainder of 30% or less capacity the indication of the phone gets rather erroneuos and battery level may drop 10-20% within some instants. I actually left my charger in the house of a friend not long ago and I am currently charging it on the USB-port of my computer, which naturally takes longer. 
  As soon as I get my original charger back I will do some more sampling and share my experience. But over all I notice exactly as you describe the astonishing duration of the battery (I've been showing off to all my friends) has been shortened significantly (what will I tell them now?).
  
  Cheers
 
 Martin
 
 
 Am 14.10.2016 um 17:10 schrieb Marcin Xc:
  
 Hi Martin!
 
 I also experienced this case last week but it had nothing in common with OTA13 I think (I also use e4.5 krillin with two sim cards). I fell in love with this phone because of the battery that hold even for a week if nobody called me. Now I need to find my charger every 3-4 days as You wrote. Last week however I was losing about 50% capacity per day. Until the reboot. After reboot I'm loosing again about 15%-20% per day. The phone load to 99% quite normal. Then the very last 1% needs longer till the battery is full. Now a bit of my experience and observation of all Li-ion batteries. Before the week I mentioned above I discharged the battery below 20%. As I read many times and experienced on many devices (especially Nokia phones that used to have great batteries that never died) Li-ion doesn't like to be brought  under the 20-30% level. Every time I went with my Nokia to the 20% or below, battery lasted shorter period of time before I connected it to a charger at over 50-60%. My tip also for You would be to reboot the phone and connect it to the charger every time You see the battery state goes under this 50-60%. You can also leave the phone connected to the charger when it is full. It seems to harm only for longer periods of time in notebooks. I know people and did it myself who always left their phone connected for a whole night and didn't notice that battery died younger through overcharging. Actually I never experienced overcharging in a phone. I think You'd have to replug it every time when You see something about 95% and then hold it connected for a charge long hours long. Try my tip with charging every time over 50-60% and a bit "overcharging" instead of disconnecting from a charger instantly when You see the battery is full. Another theory is that a 2A charger is better than a 1A. My Nexus 5 which has a pretty weak battery is a great testing device. I noticed it discharges longer when I charge it with an original 1A charger and I'm not sure if the 2A charger is not the reason why it hardly makes it through a day. I'd have to start to charge it now with USB 2.0 500mA to check if the experienced theory is right if its battery ain't already "impaired" too much. I read many theories abut batteries and at some points it never reaffirmed my experiences. I one article I read recently was told that the best capacity of Li-ion batteries is between 30-40% till 90%. My Nexus always lost the first 10% from 100 to 90 in a blink of an eye. If You'll try something, share Your experiences. It is pretty interesting if You confirm my theory. Last week I thought already that discharging under 10% was my biggest mistake and the battery will never as strong again as before. But I made it and as I said, I lose again about 15-20% per day, not 50%.  I didn't notice OTA-13 changed anything. 
  Best regards 
  Marcin
   
 
        From: Martin Bolte <martinbolte@xxxxxxxxxxxxxx>
 To: Ubuntu Phone <ubuntu-phone@xxxxxxxxxxxxxxxxxxx> 
 Sent: Friday, October 14, 2016 3:29 PM
 Subject: [Ubuntu-phone] Power management in OTA 13
  
 Hello all,
 
 since I updated to OTA 13 I observe a change in power management of the 
 device. It is taking quite longer to load the device and when the 
 battery had been lasting for 3-4 days until the next reload was 
 necessary this term was cut by half to 1-2 days currently.
 
 Not sure if someone observed anything similar. I am using a bq Aquaris 
 e4.5 with Krillin installed on it.
 
 Cheers
 
 Martin
 
 
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