1. link68759's Avatar
    I have the lumia 820, and according to my battery app, last night I had a consistent battery drain of -6%/hr! This is ridiculous. WM6 had a 1-2%/hr drain and that OS had no freaking restraints whatsoever!

    I want to get a feel for what other WP8 owners have for average idle battery drain. I'm going to catalog which settings have what effect on battery drain, compared against what I normally have enabled (the first set of data/pictures).

    To measure drain like as pictured, Enless Soft has a battery app that reports the most information of any battery app in the store. May not be the prettiest, but it's the most functional.

    So! Report your average drain over the course of several hours where you do not touch the phone at all. Please try to copy my exact format, and be as thorough and precise as possible.

    Phone: Lumia 820
    Carrier/Country: AT&T US
    Version: GDR3 8.0.10521.155
    Wifi: enabled and connected
    "Keep wifi on": Enabled
    Location: Enabled
    Find my phone: Push enabled; save location periodically enabled
    Backup: applist+settings enabled; text messages enabled; photos disabled
    Bluetooth: Disabled
    tap+send: Enabled
    Signal: 3-4 bars LTE
    Glance; peek enabled
    Enabled background tasks: Battery; Here Drive+; Nextgen Reader; Today's word; Weather flow; WPCentral
    Avg Drain: -6%/hr




    -----------------------------------------UPDATE-----------------------------------------


    Phone: Lumia 820
    Carrier/Country: AT&T US
    Version: GDR3 8.0.10521.155
    Wifi: Turned Off
    "Keep wifi on": Enabled
    Location: Enabled
    Find my phone: Push enabled; save location periodically enabled
    Backup: applist+settings enabled; text messages enabled; photos disabled
    Bluetooth: Disabled
    tap+send: Enabled
    Signal: 3-4 bars LTE
    Glance; peek enabled
    Enabled background tasks: Battery; Here Drive+; Nextgen Reader; Weather flow; WPCentral
    Avg Drain: -1.30%/hr (32 pts of data. I retook the snapshot a day later and the "68 measurements" is inclusive of the rest of the day)




    -----------------------------------------UPDATE-----------------------------------------


    Phone: Lumia 820
    Carrier/Country: AT&T US
    Version: GDR3 8.0.10521.155
    Wifi: Turned Off
    "Keep wifi on": Enabled
    Location: Enabled
    Find my phone: Push enabled; save location periodically enabled
    Backup: applist+settings enabled; text messages enabled; photos disabled
    Bluetooth: Disabled
    tap+send: Disabled
    Signal: 3-4 bars LTE
    Glance; peek enabled
    Enabled background tasks: Battery; Here Drive+; Nextgen Reader; Weather flow; WPCentral
    Avg drain: -0.74%/hr



    -----------------------------------------Results-----------------------------------------
    Wifi when connected (but not necessarily in use) is responsible for an average drain of -4.7%/hr on my device!
    tap+send is responsible for an average drain of -0.56%/hr
    Last edited by link68759; 12-18-2013 at 11:38 AM.
    12-13-2013 12:52 PM
  2. taymur's Avatar
    Im having battery problems too, so I hard reset my phone, and im going to tackle this issue once and for all. Ill see my average discharge during he night. Although it was 2%, went up to 7%, now its saying 9%. **** im using it soo this cant be accuratly measured.
    12-13-2013 01:17 PM
  3. dznk's Avatar
    Now and then, mine will show a very quick discharge rate, but simply turning the phone off and then back on again, the battery discharge rate slows down. Also, when mine does this, say the battery level is approx 50%, turning the phone off and then back on again, it may well report 70-80% for example. Seems to be a battery monitoring glitch on mine. Doesn't happen too often, but every week or two I just switch mine off and back on again and the battery level and the discharge rate go back to 'normal'.
    12-13-2013 02:53 PM
  4. pankaj981's Avatar
    I just posted this in the 925 forums...on an unlocked T-Mobile Lumia 925 with LTE on, 5 emails, Facebook, Whatsapp, WiFi, I get this...

    wp_20131213_12_22_29_pro.jpg
    12-13-2013 03:15 PM
  5. ratsttam's Avatar
    I get an idle drain of 2-4% when I'm at home, and an idle drain of 6-8% when it's sitting on my desk at work. Signal strength has a LOT to do with idle drain, as the phone has to up the transceiver power in weak areas. Having things like wifi/bluetooth/nfc turned on, will cause it to poll those services more too.
    12-13-2013 04:02 PM
  6. Ashish Saraf1's Avatar
    I have the lumia 820, and according to my battery app, last night I had a consistent battery drain of -6%/hr! This is ridiculous. WM6 had a 1-2%/hr drain and that OS had no freaking restraints whatsoever!

    I want to get a feel for what other WP8 owners have for average idle battery drain.

    So! Report your average drain over the course of several hours where you do not touch the phone at all. Also, list any relevant information, such as

    Phone: Lumia 820
    Carrier/Country: AT&T US
    Version: GDR3 8.0.10521.155
    Wifi: enabled and connected
    "Keep wifi on": Enabled
    Location: Enabled
    Find my phone: Push enabled; save location periodically enabled
    Backup: applist+settings enabled; text messages enabled; photos disabled
    Bluetooth: Disabled
    tap+send: Enabled
    Signal: 3-4 bars LTE
    Glance; peek enabled
    Enabled background tasks: Battery; Here Drive+; Nextgen Reader; Today's word; Weather flow; WPCentral

    To measure drain like as pictured, Enless Soft has a battery app that reports the most information of any battery app in the store. May not be the prettiest, but it's the most functional.

    http://i.imgur.com/bDiQ0yx.png
    http://i.imgur.com/nyGmaBg.png
    Sent from my Windows 8 device using Board Express Pro
    I have an 820 too..just soft reset your phone..you will notice 2% drain

    sent either from my Nokia Lumia 820 or HTC Desire HD
    12-13-2013 07:17 PM
  7. link68759's Avatar
    Thanks for the input all, but remember- this thread is about collecting statistics from varying models and settings. I'm not asking for advice really.

    Also, contributions should be screenshots of the graph over several hours- this is proof of validity. You can't just install the app, look at the graph and give me a number- I have no way of knowing your current configuration, the truthfulness or accuracy of what you told me, etc, and the act of looking at the graph to get an instantaneous result skews the data. The graph should be collected data over several hours where you didn't touch the phone.

    Tonight I think I'm going to keep all the settings the same, but turn glance off when I go to sleep. I'll post an update within 24 hours.

    Also note battery saver should be off for all tests, or at least have the range of the test out of battery saver's reach. I'm sure battery saver works as advertised, but I do not consider this normal operation of the phone and having it on invalidates the data.
    WanderingTraveler likes this.
    12-13-2013 11:25 PM
  8. WanderingTraveler's Avatar
    Average battery drain while asleep:
    -If airplane mode and battery saver are on, 2%/9h.
    -If airplane mode is off with nothing else turned on, 1%/3h.
    -With cellular on, 1%/h. (HSPA.)
    -Everything on, 2%/h. (EDGE :P)

    Lumia 620 user with GDR3 Dev Preview installed.
    So many background processes that I can't list them all!
    link68759 likes this.
    12-13-2013 11:47 PM
  9. gedzum's Avatar
    Idle battery drain for me is around 2%. Regular usage goes up to around 3-5%. Games are the biggest battery drain for me.
    12-14-2013 03:26 AM
  10. taymur's Avatar
    After hard resetting my device, with almost no apps installed im getting 2% but this the first time that happened. Loving it.
    rcazador likes this.
    12-14-2013 04:43 AM
  11. rcazador's Avatar
    Off Topic, how much does Location affect battery life(not actually navigating, simply leaving GPS on for geotagging photos and such)? Is it fine to just leave it on(in battery life terms)?
    12-14-2013 06:26 AM
  12. sejgiul's Avatar
    For me its fine. I always have it on and idle drain is at the most 1% per hour :)
    rcazador likes this.
    12-14-2013 06:36 AM
  13. Optiplex330's Avatar
    ATIV S. Start at 100% (this is important for some reason). After 6 hours, still 100%.
    1. Idle at night
    2. Mobile Data on. Receiving a couple of emails but not looked at it.
    Everything else off (location, Wifi, Bluetooth). Only background tasks, if you can call that, would be Whatsapp, Wechat and Skype which don't seem to consume any power anyway.

    If starting off not at 100%, same setting, probably 0.5% per hour. With both Wifi & Mobile Data on, about 1%/hr.
    Last edited by Optiplex330; 12-14-2013 at 04:56 PM.
    12-14-2013 06:49 AM
  14. link68759's Avatar
    Well I ended up only getting 4 hours of sleep and thus only 4 hours of data collection last night, so I'm not going to formally take pictures and notes of this one, but it *looks* like glance actually does more than a significant number on performance... what a pity.
    Glance: -6%/hr
    No glance: bouncing between -2%/hr and -4%/hr. I only collected 10 points of data, 5 points were at -2%/hr, 3 points were at -3%/hr, 1 point of -1%/hr and 1 point of -4%/hr.

    Until I collect more data, it looks like glance is a serious battery drain :(
    Not sure if I'm willing to give it up though :P I have 3 spare batteries for my 820

    edit- I'm going to dig up my other 820 with broken digitizer and test its drain with cellular off.
    edit2- The broken digitizer has a dead spot in the middle of the screen, so I literally cannot type my password into the developer preview thing nor can I turn on glance... lol. Also backups are off so it doesn't screw with my current phone's backup. I hard reset and uninstalled everything that could be uninstalled, installed the battery app, and now time will tell...
    edit3- huh. 15 hours later and the battery is still supposedly at 100%. However the battery app wasn't collecting any data during this time, so rebooted the phone, and I'm beginning to suspect it isn't reading the battery right.
    edit4- With no sim card, no apps, GDR2 amber, airplane mode, etc... -0.35%/hr. Wow!
    Last edited by link68759; 12-15-2013 at 07:11 PM.
    12-14-2013 07:23 AM
  15. Optiplex330's Avatar
    If I remember correctly (which means i could be wrong), my old Symbian N8 which has something like Glance out-of-the-box showing Clock has a statement saying to switch if off if saving battery is paramount.
    12-14-2013 04:59 PM
  16. link68759's Avatar
    UPDATED ORIGINAL POST

    Wifi is apparently a HUGE drain. The only two changes I made were to uninstall "today's word" app, and turn off wifi.

    Average drain was -1.30%/hr over 32 points of data, with an estimated life of 3 days and 5 hours.

    Again, I cannot stress how awesome enless soft's battery app is. No other app lets you see stats and averages *over a user defined time period*,
    12-17-2013 12:23 PM
  17. link68759's Avatar
    Today's update is a little inconsistent, sorry.

    I turned off 'tap and send' but also left wifi off. Tonight I'll leave wifi on while tap and send is off.
    If everything else under the hood is consistently draining battery across all my tests, then it does look like "tap and send" has an appreciable drain.

    Today's idle drain was -0.74%/hr, estimated life 5 days 15 hours.
    12-18-2013 11:10 AM

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